diff --git a/README.md b/README.md
index b2e5fd6a2..b94d43dcc 100644
--- a/README.md
+++ b/README.md
@@ -112,23 +112,23 @@ RainLoop 1.14 vs SnappyMail
 
 |js/*           	|RainLoop 	|Snappy   	|
 |---------------	|--------:	|--------:	|
-|admin.js        	|2.130.942	|  628.009	|
-|app.js          	|4.184.455	|2.340.222	|
+|admin.js        	|2.130.942	|  627.638	|
+|app.js          	|4.184.455	|2.337.633	|
 |boot.js         	|  671.522	|    4.842	|
-|libs.js         	|  647.614	|  235.361	|
+|libs.js         	|  647.614	|  235.475	|
 |polyfills.js    	|  325.834	|        0	|
 |serviceworker.js	|        0	|      285	|
-|TOTAL           	|7.960.367	|3.208.719	|
+|TOTAL           	|7.960.367	|3.205.873	|
 
 |js/min/*       	|RainLoop 	|Snappy   	|Rain gzip	|gzip     	|brotli   	|
 |---------------	|--------:	|--------:	|--------:	|--------:	|--------:	|
-|admin.min.js    	|  252.147	|   85.184	| 73.657	| 22.617	| 19.879	|
-|app.min.js      	|  511.202	|  310.381	|140.462	| 84.002	| 68.447	|
+|admin.min.js    	|  252.147	|   85.136	| 73.657	| 22.606	| 19.875	|
+|app.min.js      	|  511.202	|  309.954	|140.462	| 83.913	| 68.565	|
 |boot.min.js     	|   66.007	|    2.630	| 22.567	|  1.375	|  1.189	|
-|libs.min.js     	|  572.545	|  130.817	|176.720	| 47.296	| 42.076	|
+|libs.min.js     	|  572.545	|  130.930	|176.720	| 47.397	| 42.116	|
 |polyfills.min.js	|   32.452	|        0	| 11.312	|      0	|      0	|
-|TOTAL           	|1.434.353	|  529.012	|424.718	|155.290	|131.591	|
-|TOTAL (no admin)	|1.182.206	|  443.828	|351.061	|132.673	|111.712	|
+|TOTAL           	|1.434.353	|  528.650	|424.718	|155.291	|131.745	|
+|TOTAL (no admin)	|1.182.206	|  443.514	|351.061	|132.685	|111.870	|
 
 For a user its around 62% smaller and faster than traditional RainLoop.
 
diff --git a/dev/App/Admin.js b/dev/App/Admin.js
index f54b4ab47..661dac3ac 100644
--- a/dev/App/Admin.js
+++ b/dev/App/Admin.js
@@ -69,7 +69,7 @@ class AdminApp extends AbstractApp {
 				let list = [];
 				const loading = {};
 
-				PackageStore.packages().forEach(item => {
+				PackageStore.packages.forEach(item => {
 					if (item && item.loading()) {
 						loading[item.file] = item;
 					}
diff --git a/dev/App/User.js b/dev/App/User.js
index 793f52e13..44fb6d130 100644
--- a/dev/App/User.js
+++ b/dev/App/User.js
@@ -122,7 +122,7 @@ class AppUser extends AbstractApp {
 	}
 
 	reloadFlagsCurrentMessageListAndMessageFromCache() {
-		MessageStore.messageList().forEach(message =>
+		MessageStore.messageList.forEach(message =>
 			MessageFlagsCache.initMessage(message)
 		);
 		MessageFlagsCache.initMessage(MessageStore.message());
@@ -271,7 +271,7 @@ class AppUser extends AbstractApp {
 				}
 			}
 
-			this.reloadMessageList(!MessageStore.messageList().length);
+			this.reloadMessageList(!MessageStore.messageList.length);
 			this.quotaDebounce();
 		}
 	}
@@ -479,9 +479,9 @@ class AppUser extends AbstractApp {
 				let parentEmail = Settings.get('ParentEmail') || sAccountEmail;
 
 				if (Array.isArray(oData.Result.Accounts)) {
-					AccountStore.accounts().forEach(oAccount => {
-						counts[oAccount.email] = oAccount.count();
-					});
+					AccountStore.accounts.forEach(oAccount =>
+						counts[oAccount.email] = oAccount.count()
+					);
 
 					delegateRunOnDestroy(AccountStore.accounts());
 
@@ -673,13 +673,10 @@ class AppUser extends AbstractApp {
 									if (folder.fullNameRaw === FolderStore.currentFolderFullNameRaw()) {
 										this.reloadMessageList();
 									}
-								} else if (unreadCountChange) {
-									if (folder.fullNameRaw === FolderStore.currentFolderFullNameRaw()) {
-										const list = MessageStore.messageList();
-										if (Array.isNotEmpty(list)) {
-											this.folderInformation(folder.fullNameRaw, list);
-										}
-									}
+								} else if (unreadCountChange
+								 && folder.fullNameRaw === FolderStore.currentFolderFullNameRaw()
+								 && MessageStore.messageList.length) {
+									this.folderInformation(folder.fullNameRaw, MessageStore.messageList());
 								}
 							}
 						});
diff --git a/dev/Common/Cache.js b/dev/Common/Cache.js
index 1de309971..72437771b 100644
--- a/dev/Common/Cache.js
+++ b/dev/Common/Cache.js
@@ -210,8 +210,8 @@ export class MessageFlagsCache
 				}
 			}
 
-			if (message.threads().length) {
-				const unseenSubUid = message.threads().find(sSubUid => {
+			if (message.threads.length) {
+				const unseenSubUid = message.threads.find(sSubUid => {
 					if (uid !== sSubUid) {
 						const subFlags = this.getFor(message.folder, sSubUid);
 						return subFlags && subFlags.length && !!subFlags[0];
@@ -219,7 +219,7 @@ export class MessageFlagsCache
 					return false;
 				});
 
-				const flaggedSubUid = message.threads().find(sSubUid => {
+				const flaggedSubUid = message.threads.find(sSubUid => {
 					if (uid !== sSubUid) {
 						const subFlags = this.getFor(message.folder, sSubUid);
 						return subFlags && subFlags.length && !!subFlags[1];
diff --git a/dev/Common/Selector.js b/dev/Common/Selector.js
index 0a5c925a2..1a8159cc9 100644
--- a/dev/Common/Selector.js
+++ b/dev/Common/Selector.js
@@ -42,7 +42,7 @@ class Selector {
 	) {
 		this.list = koList;
 
-		this.listChecked = ko.computed(() => this.list().filter(item => item.checked())).extend({ rateLimit: 0 });
+		this.listChecked = ko.computed(() => this.list.filter(item => item.checked())).extend({ rateLimit: 0 });
 		this.isListChecked = ko.computed(() => 0 < this.listChecked().length);
 
 		this.focusedItem = koFocusedItem || ko.observable(null);
@@ -329,11 +329,11 @@ class Selector {
 			result = null;
 
 		const pageStep = 10,
-			list = this.list(),
-			listLen = list ? list.length : 0,
+			list = this.list,
+			listLen = list.length,
 			focused = this.focusedItem();
 
-		if (0 < listLen) {
+		if (listLen) {
 			if (focused) {
 				if (isArrow) {
 					let i = list.indexOf(focused);
diff --git a/dev/Common/UtilsUser.js b/dev/Common/UtilsUser.js
index 7e5fb9011..df3454a58 100644
--- a/dev/Common/UtilsUser.js
+++ b/dev/Common/UtilsUser.js
@@ -326,7 +326,7 @@ export function folderListOptionsBuilder(
 			}
 		}
 
-		if (oItem.subscribed() && oItem.subFolders().length) {
+		if (oItem.subscribed() && oItem.subFolders.length) {
 			aResult = aResult.concat(
 				folderListOptionsBuilder(
 					[],
diff --git a/dev/Knoin/AbstractScreen.js b/dev/Knoin/AbstractScreen.js
index e367ad960..10eeffc26 100644
--- a/dev/Knoin/AbstractScreen.js
+++ b/dev/Knoin/AbstractScreen.js
@@ -11,7 +11,7 @@ export class AbstractScreen {
 	/**
 	 * @returns {Array}
 	 */
-	viewModels() {
+	get viewModels() {
 		return this.aViewModels;
 	}
 
diff --git a/dev/Knoin/Knoin.js b/dev/Knoin/Knoin.js
index 0af4fca10..79cbf8bcc 100644
--- a/dev/Knoin/Knoin.js
+++ b/dev/Knoin/Knoin.js
@@ -263,8 +263,8 @@ function screenOnRoute(screenName, subPart) {
 			if (!vmScreen.__builded) {
 				vmScreen.__builded = true;
 
-				if (isNonEmptyArray(vmScreen.viewModels())) {
-					vmScreen.viewModels().forEach(ViewModelClass => {
+				if (vmScreen.viewModels.length) {
+					vmScreen.viewModels.forEach(ViewModelClass => {
 						buildViewModel(ViewModelClass, vmScreen);
 					});
 				}
@@ -278,8 +278,8 @@ function screenOnRoute(screenName, subPart) {
 					currentScreen.onHide && currentScreen.onHide();
 					currentScreen.onHideWithDelay && setTimeout(()=>currentScreen.onHideWithDelay(), 500);
 
-					if (isNonEmptyArray(currentScreen.viewModels())) {
-						currentScreen.viewModels().forEach(ViewModelClass => {
+					if (isNonEmptyArray(currentScreen.viewModels)) {
+						currentScreen.viewModels.forEach(ViewModelClass => {
 							if (
 								ViewModelClass.__vm &&
 								ViewModelClass.__dom &&
@@ -302,8 +302,8 @@ function screenOnRoute(screenName, subPart) {
 				if (currentScreen && !isSameScreen) {
 					currentScreen.onShow && currentScreen.onShow();
 
-					if (isNonEmptyArray(currentScreen.viewModels())) {
-						currentScreen.viewModels().forEach(ViewModelClass => {
+					if (isNonEmptyArray(currentScreen.viewModels)) {
+						currentScreen.viewModels.forEach(ViewModelClass => {
 							if (
 								ViewModelClass.__vm &&
 								ViewModelClass.__dom &&
diff --git a/dev/Model/Filter.js b/dev/Model/Filter.js
index ea1ae21d3..e398d77b1 100644
--- a/dev/Model/Filter.js
+++ b/dev/Model/Filter.js
@@ -46,7 +46,7 @@ class FilterModel extends AbstractModel {
 			actionType: FiltersAction.MoveTo
 		});
 
-		this.conditions = ko.observableArray([]);
+		this.conditions = ko.observableArray();
 
 		const fGetRealFolderName = (folderFullNameRaw) => {
 			const folder = getFolderFromCacheList(folderFullNameRaw);
@@ -137,7 +137,7 @@ class FilterModel extends AbstractModel {
 			return false;
 		}
 
-		if (this.conditions().length && this.conditions().find(cond => cond && !cond.verify())) {
+		if (this.conditions.length && this.conditions.find(cond => cond && !cond.verify())) {
 			return false;
 		}
 
@@ -180,7 +180,7 @@ class FilterModel extends AbstractModel {
 			ID: this.id,
 			Enabled: this.enabled() ? '1' : '0',
 			Name: this.name(),
-			Conditions: this.conditions().map(item => item.toJson()),
+			Conditions: this.conditions.map(item => item.toJson()),
 			ConditionsType: this.conditionsType(),
 
 			ActionType: this.actionType(),
@@ -259,7 +259,7 @@ class FilterModel extends AbstractModel {
 		filter.actionKeep(this.actionKeep());
 		filter.actionNoStop(this.actionNoStop());
 
-		filter.conditions(this.conditions().map(item => item.cloneSelf()));
+		filter.conditions(this.conditions.map(item => item.cloneSelf()));
 
 		return filter;
 	}
diff --git a/dev/Model/Folder.js b/dev/Model/Folder.js
index 7580bd467..f06ee9c1d 100644
--- a/dev/Model/Folder.js
+++ b/dev/Model/Folder.js
@@ -85,7 +85,7 @@ class FolderModel extends AbstractModel {
 
 				hasSubscribedSubfolders:
 					() =>
-						!!folder.subFolders().find(
+						!!folder.subFolders.find(
 							oFolder => (oFolder.subscribed() || oFolder.hasSubscribedSubfolders()) && !oFolder.isSystemFolder()
 						),
 
@@ -129,7 +129,7 @@ class FolderModel extends AbstractModel {
 					return '';
 				},
 
-				canBeDeleted: () => !folder.isSystemFolder() && !folder.subFolders().length,
+				canBeDeleted: () => !folder.isSystemFolder() && !folder.subFolders.length,
 
 				selectableForFolderList: () => !folder.isSystemFolder() && folder.selectable,
 
@@ -218,7 +218,7 @@ class FolderModel extends AbstractModel {
 				hasUnreadMessages: () => 0 < folder.messageCountUnread() && folder.printableUnreadCount(),
 
 				hasSubscribedUnreadMessagesSubfolders: () =>
-						!!folder.subFolders().find(
+						!!folder.subFolders.find(
 							folder => folder.hasUnreadMessages() || folder.hasSubscribedUnreadMessagesSubfolders()
 						)
 			});
diff --git a/dev/Model/Message.js b/dev/Model/Message.js
index 95b8f4f3d..bde218f19 100644
--- a/dev/Model/Message.js
+++ b/dev/Model/Message.js
@@ -72,12 +72,12 @@ class MessageModel extends AbstractModel {
 		});
 
 		this.attachments = ko.observableArray(new AttachmentCollectionModel);
-		this.attachmentsSpecData = ko.observableArray([]);
-		this.threads = ko.observableArray([]);
+		this.attachmentsSpecData = ko.observableArray();
+		this.threads = ko.observableArray();
 
 		this.addComputables({
 			attachmentIconClass: () => File.getCombinedIconClass(this.hasAttachments() ? this.attachmentsSpecData() : []),
-			threadsLen: () => this.threads().length,
+			threadsLen: () => this.threads.length,
 			isImportant: () => MessagePriority.High === this.priority(),
 		});
 	}
@@ -502,7 +502,7 @@ class MessageModel extends AbstractModel {
 						el.src = attachment.linkPreview();
 					}
 				} else if (data.xSrcLocation) {
-					const attachment = this.attachments().find(item => data.xSrcLocation === item.contentLocation)
+					const attachment = this.attachments.find(item => data.xSrcLocation === item.contentLocation)
 						|| findAttachmentByCid(data.xSrcLocation);
 					if (attachment && attachment.download) {
 						el.loading = 'lazy';
diff --git a/dev/Model/SieveScript.js b/dev/Model/SieveScript.js
index e5722e7f2..6022470bd 100644
--- a/dev/Model/SieveScript.js
+++ b/dev/Model/SieveScript.js
@@ -274,7 +274,7 @@ class SieveScriptModel extends AbstractModel
 			hasChanges: false
 		});
 
-		this.filters = ko.observableArray([]);
+		this.filters = ko.observableArray();
 //		this.saving = ko.observable(false).extend({ throttle: 200 });
 
 		this.addSubscribables({
@@ -296,7 +296,7 @@ class SieveScriptModel extends AbstractModel
 
 	verify() {
 		this.nameError(!this.name().trim());
-		this.bodyError(this.allowFilters() ? !this.filters().length : !this.body().trim());
+		this.bodyError(this.allowFilters() ? !this.filters.length : !this.body().trim());
 		return !this.nameError() && !this.bodyError();
 	}
 
@@ -305,7 +305,7 @@ class SieveScriptModel extends AbstractModel
 			name: this.name(),
 			active: this.active() ? '1' : '0',
 			body: this.body(),
-			filters: this.filters().map(item => item.toJson())
+			filters: this.filters.map(item => item.toJson())
 		};
 	}
 
diff --git a/dev/Remote/User/Fetch.js b/dev/Remote/User/Fetch.js
index 5f05d1d71..468ffa3a9 100644
--- a/dev/Remote/User/Fetch.js
+++ b/dev/Remote/User/Fetch.js
@@ -446,8 +446,8 @@ class RemoteUserFetch extends AbstractFetchRemote {
 					uids.push(messageListItem.uid);
 				}
 
-				if (messageListItem.threads().length) {
-					messageListItem.threads().forEach(uid => {
+				if (messageListItem.threads.length) {
+					messageListItem.threads.forEach(uid => {
 						if (!MessageFlagsCache.getFor(messageListItem.folder, uid)) {
 							uids.push(uid);
 						}
diff --git a/dev/Screen/AbstractSettings.js b/dev/Screen/AbstractSettings.js
index 25cecb726..e2c394b5c 100644
--- a/dev/Screen/AbstractSettings.js
+++ b/dev/Screen/AbstractSettings.js
@@ -13,7 +13,7 @@ class AbstractSettingsScreen extends AbstractScreen {
 	constructor(viewModels) {
 		super('settings', viewModels);
 
-		this.menu = ko.observableArray([]);
+		this.menu = ko.observableArray();
 
 		this.oCurrentSubScreen = null;
 
@@ -113,7 +113,7 @@ class AbstractSettingsScreen extends AbstractScreen {
 						o.oCurrentSubScreen.viewModelDom.hidden = false;
 						o.oCurrentSubScreen.onShow && o.oCurrentSubScreen.onShow();
 
-						o.menu().forEach(item => {
+						o.menu.forEach(item => {
 							item.selected(
 								settingsScreen &&
 									settingsScreen.__rlSettingsData &&
diff --git a/dev/Screen/User/MailBox.js b/dev/Screen/User/MailBox.js
index b0b28d484..aee96bb48 100644
--- a/dev/Screen/User/MailBox.js
+++ b/dev/Screen/User/MailBox.js
@@ -106,7 +106,7 @@ class MailBoxUserScreen extends AbstractScreen {
 			FolderStore.foldersInboxUnreadCount(e.detail);
 
 			const email = AccountStore.email();
-			AccountStore.accounts().forEach(item => {
+			AccountStore.accounts.forEach(item => {
 				if (item && email === item.email) {
 					item.count(e.detail);
 				}
diff --git a/dev/Settings/Admin/General.js b/dev/Settings/Admin/General.js
index 4684fac65..afe06c067 100644
--- a/dev/Settings/Admin/General.js
+++ b/dev/Settings/Admin/General.js
@@ -67,7 +67,7 @@ class GeneralAdminSettings {
 				: '';
 
 		this.themesOptions = ko.computed(() =>
-			this.themes().map(theme => ({ optValue: theme, optText: convertThemeName(theme) }))
+			this.themes.map(theme => ({ optValue: theme, optText: convertThemeName(theme) }))
 		);
 
 		this.languageFullName = ko.computed(() => convertLangName(this.language()));
diff --git a/dev/Settings/Admin/Packages.js b/dev/Settings/Admin/Packages.js
index 370ada9bd..d4197e197 100644
--- a/dev/Settings/Admin/Packages.js
+++ b/dev/Settings/Admin/Packages.js
@@ -15,13 +15,13 @@ class PackagesAdminSettings {
 		this.packagesMainUpdatable = PackageStore.packagesMainUpdatable;
 
 		this.packagesCurrent = ko.computed(() =>
-			this.packages().filter(item => item && item.installed && !item.compare)
+			this.packages.filter(item => item && item.installed && !item.compare)
 		);
 		this.packagesAvailableForUpdate = ko.computed(() =>
-			this.packages().filter(item => item && item.installed && !!item.compare)
+			this.packages.filter(item => item && item.installed && !!item.compare)
 		);
 		this.packagesAvailableForInstallation = ko.computed(() =>
-			this.packages().filter(item => item && !item.installed)
+			this.packages.filter(item => item && !item.installed)
 		);
 
 		this.visibility = ko.computed(() => (PackageStore.packages.loading() ? 'visible' : 'hidden'));
@@ -47,7 +47,7 @@ class PackagesAdminSettings {
 				}
 			}
 
-			this.packages().forEach(item => {
+			this.packages.forEach(item => {
 				if (item && packageToRequest && item.loading && item.loading() && packageToRequest.file === item.file) {
 					packageToRequest.loading(false);
 					item.loading(false);
diff --git a/dev/Settings/User/Filters.js b/dev/Settings/User/Filters.js
index 69017f0a8..f77e0fbe9 100644
--- a/dev/Settings/User/Filters.js
+++ b/dev/Settings/User/Filters.js
@@ -91,7 +91,7 @@ class FiltersUserSettings {
 		Remote.filtersScriptActivate(
 			(result, data) => {
 				if (StorageResultType.Success === result && data && data.Result) {
-					this.scripts().forEach(script => script.active(script.name() === name));
+					this.scripts.forEach(script => script.active(script.name() === name));
 				} else {
 					this.setError((data && data.ErrorCode)
 						? (data.ErrorMessageAdditional || getNotification(data.ErrorCode))
diff --git a/dev/Settings/User/OpenPgp.js b/dev/Settings/User/OpenPgp.js
index 6293766ac..64dd77d72 100644
--- a/dev/Settings/User/OpenPgp.js
+++ b/dev/Settings/User/OpenPgp.js
@@ -43,7 +43,7 @@ class OpenPgpUserSettings {
 			this.openPgpKeyForDeletion(null);
 
 			if (openPgpKeyToRemove && PgpStore.openpgpKeyring) {
-				const findedItem = PgpStore.openpgpkeys().find(key => openPgpKeyToRemove === key);
+				const findedItem = PgpStore.openpgpkeys.find(key => openPgpKeyToRemove === key);
 				if (findedItem) {
 					PgpStore.openpgpkeys.remove(findedItem);
 					delegateRunOnDestroy(findedItem);
diff --git a/dev/Settings/User/Themes.js b/dev/Settings/User/Themes.js
index 18c9e8c64..fb86d4a37 100644
--- a/dev/Settings/User/Themes.js
+++ b/dev/Settings/User/Themes.js
@@ -13,7 +13,7 @@ class ThemesUserSettings {
 	constructor() {
 		this.theme = ThemeStore.theme;
 		this.themes = ThemeStore.themes;
-		this.themesObjects = ko.observableArray([]);
+		this.themesObjects = ko.observableArray();
 
 		this.background = {};
 		this.background.name = ThemeStore.themeBackgroundName;
@@ -27,7 +27,7 @@ class ThemesUserSettings {
 		this.themeTrigger = ko.observable(SaveSettingsStep.Idle).extend({ throttle: 100 });
 
 		this.theme.subscribe((value) => {
-			this.themesObjects().forEach(theme => {
+			this.themesObjects.forEach(theme => {
 				theme.selected(value === theme.name);
 			});
 
@@ -54,7 +54,7 @@ class ThemesUserSettings {
 		const currentTheme = this.theme();
 
 		this.themesObjects(
-			this.themes().map(theme => ({
+			this.themes.map(theme => ({
 				name: theme,
 				nameDisplay: convertThemeName(theme),
 				selected: ko.observable(theme === currentTheme),
diff --git a/dev/Stores/Admin/Domain.js b/dev/Stores/Admin/Domain.js
index 4bd9914ab..ffdbe767c 100644
--- a/dev/Stores/Admin/Domain.js
+++ b/dev/Stores/Admin/Domain.js
@@ -2,9 +2,9 @@ import ko from 'ko';
 
 class DomainAdminStore {
 	constructor() {
-		this.domains = ko.observableArray([]);
+		this.domains = ko.observableArray();
 		this.domains.loading = ko.observable(false).extend({ 'throttle': 100 });
-		this.domainsWithoutAliases = ko.computed(() => this.domains().filter(item => item && !item.alias));
+		this.domainsWithoutAliases = ko.computed(() => this.domains.filter(item => item && !item.alias));
 	}
 }
 
diff --git a/dev/Stores/Admin/Package.js b/dev/Stores/Admin/Package.js
index 43ec82348..3edb010a1 100644
--- a/dev/Stores/Admin/Package.js
+++ b/dev/Stores/Admin/Package.js
@@ -2,7 +2,7 @@ import ko from 'ko';
 
 class PackageAdminStore {
 	constructor() {
-		this.packages = ko.observableArray([]);
+		this.packages = ko.observableArray();
 		this.packages.loading = ko.observable(false).extend({ throttle: 100 });
 
 		ko.addObservablesTo(this, {
diff --git a/dev/Stores/Admin/Plugin.js b/dev/Stores/Admin/Plugin.js
index 3dc4d8bc8..c60b03e84 100644
--- a/dev/Stores/Admin/Plugin.js
+++ b/dev/Stores/Admin/Plugin.js
@@ -2,7 +2,7 @@ import ko from 'ko';
 
 class PluginAdminStore {
 	constructor() {
-		this.plugins = ko.observableArray([]);
+		this.plugins = ko.observableArray();
 		this.plugins.loading = ko.observable(false).extend({ throttle: 100 });
 		this.plugins.error = ko.observable('');
 	}
diff --git a/dev/Stores/Language.js b/dev/Stores/Language.js
index 1da16c77b..a2d1139e0 100644
--- a/dev/Stores/Language.js
+++ b/dev/Stores/Language.js
@@ -2,8 +2,8 @@ import ko from 'ko';
 
 class LanguageStore {
 	constructor() {
-		this.languages = ko.observableArray([]);
-		this.languagesAdmin = ko.observableArray([]);
+		this.languages = ko.observableArray();
+		this.languagesAdmin = ko.observableArray();
 
 		this.language = ko
 			.observable('')
diff --git a/dev/Stores/Theme.js b/dev/Stores/Theme.js
index 9a7d441e1..6198c87e9 100644
--- a/dev/Stores/Theme.js
+++ b/dev/Stores/Theme.js
@@ -2,7 +2,7 @@ import ko from 'ko';
 
 class ThemeStore {
 	constructor() {
-		this.themes = ko.observableArray([]);
+		this.themes = ko.observableArray();
 		this.themeBackgroundName = ko.observable('');
 		this.themeBackgroundHash = ko.observable('');
 
diff --git a/dev/Stores/User/Account.js b/dev/Stores/User/Account.js
index 4e0c1ca18..512172026 100644
--- a/dev/Stores/User/Account.js
+++ b/dev/Stores/User/Account.js
@@ -8,10 +8,10 @@ class AccountUserStore {
 			signature: ''
 		});
 
-		this.accounts = ko.observableArray([]);
+		this.accounts = ko.observableArray();
 		this.accounts.loading = ko.observable(false).extend({ throttle: 100 });
 
-		this.getEmailAddresses = () => this.accounts().map(item => item ? item.email : null).filter(v => v);
+		this.getEmailAddresses = () => this.accounts.map(item => item ? item.email : null).filter(v => v);
 
 		this.accountsUnreadCount = ko.computed(() => 0);
 		// this.accountsUnreadCount = ko.computed(() => {
diff --git a/dev/Stores/User/App.js b/dev/Stores/User/App.js
index 3504be412..042eecb7b 100644
--- a/dev/Stores/User/App.js
+++ b/dev/Stores/User/App.js
@@ -50,7 +50,7 @@ class AppUserStore {
 			}
 		});
 
-		this.attachmentsActions = ko.observableArray([]);
+		this.attachmentsActions = ko.observableArray();
 
 		this.devEmail = '';
 		this.devPassword = '';
diff --git a/dev/Stores/User/Contact.js b/dev/Stores/User/Contact.js
index aaa5cead8..8137f8f59 100644
--- a/dev/Stores/User/Contact.js
+++ b/dev/Stores/User/Contact.js
@@ -2,7 +2,7 @@ import ko from 'ko';
 
 class ContactUserStore {
 	constructor() {
-		this.contacts = ko.observableArray([]);
+		this.contacts = ko.observableArray();
 		this.contacts.loading = ko.observable(false).extend({ throttle: 200 });
 		this.contacts.importing = ko.observable(false).extend({ throttle: 200 });
 		this.contacts.syncing = ko.observable(false).extend({ throttle: 200 });
diff --git a/dev/Stores/User/Folder.js b/dev/Stores/User/Folder.js
index 5487a5777..1c43079fe 100644
--- a/dev/Stores/User/Folder.js
+++ b/dev/Stores/User/Folder.js
@@ -36,7 +36,7 @@ class FolderUserStore {
 
 		this.namespace = '';
 
-		this.folderList = ko.observableArray([]);
+		this.folderList = ko.observableArray();
 
 		this.currentFolder = ko.observable(null).extend({ toggleSubscribeProperty: [this, 'selected'] });
 
@@ -47,7 +47,7 @@ class FolderUserStore {
 		);
 
 		this.foldersListWithSingleInboxRootFolder = ko.computed(
-			() => !this.folderList().find(folder => folder && !folder.isSystemFolder() && folder.visible())
+			() => !this.folderList.find(folder => folder && !folder.isSystemFolder() && folder.visible())
 		);
 
 		this.currentFolderFullNameRaw = ko.computed(() => (this.currentFolder() ? this.currentFolder().fullNameRaw : ''));
@@ -66,14 +66,13 @@ class FolderUserStore {
 
 		this.folderListSystemNames = ko.computed(() => {
 			const list = [getFolderInboxName()],
-				folders = this.folderList(),
 				sentFolder = this.sentFolder(),
 				draftFolder = this.draftFolder(),
 				spamFolder = this.spamFolder(),
 				trashFolder = this.trashFolder(),
 				archiveFolder = this.archiveFolder();
 
-			if (Array.isNotEmpty(folders)) {
+			if (this.folderList.length) {
 				if (sentFolder && UNUSED_OPTION_VALUE !== sentFolder) {
 					list.push(sentFolder);
 				}
@@ -178,7 +177,7 @@ class FolderUserStore {
 						timeouts.push([folder.interval, folder.fullNameRaw]);
 					}
 
-					if (folder && folder.subFolders().length) {
+					if (folder && folder.subFolders.length) {
 						fSearchFunction(folder.subFolders());
 					}
 				});
diff --git a/dev/Stores/User/Identity.js b/dev/Stores/User/Identity.js
index 7fa4ee9f4..ed3344c46 100644
--- a/dev/Stores/User/Identity.js
+++ b/dev/Stores/User/Identity.js
@@ -2,10 +2,10 @@ import ko from 'ko';
 
 class IdentityUserStore {
 	constructor() {
-		this.identities = ko.observableArray([]);
+		this.identities = ko.observableArray();
 		this.identities.loading = ko.observable(false).extend({ throttle: 100 });
 
-		this.getIDS = () => this.identities().map(item => (item ? item.id() : null)).filter(value => null !== value);
+		this.getIDS = () => this.identities.map(item => (item ? item.id() : null)).filter(value => null !== value);
 	}
 }
 
diff --git a/dev/Stores/User/Message.js b/dev/Stores/User/Message.js
index 13df98381..46c48d03b 100644
--- a/dev/Stores/User/Message.js
+++ b/dev/Stores/User/Message.js
@@ -57,7 +57,7 @@ class MessageUserStore {
 	constructor() {
 		this.staticMessage = new MessageModel();
 
-		this.messageList = ko.observableArray([]).extend({ rateLimit: 0 });
+		this.messageList = ko.observableArray().extend({ rateLimit: 0 });
 
 		ko.addObservablesTo(this, {
 			messageListCount: 0,
@@ -136,7 +136,7 @@ class MessageUserStore {
 		this.isMessageSelected = ko.computed(() => null !== this.message());
 
 		this.messageListChecked = ko
-			.computed(() => this.messageList().filter(item => item.checked()))
+			.computed(() => this.messageList.filter(item => item.checked()))
 			.extend({ rateLimit: 0 });
 
 		this.hasCheckedMessages = ko.computed(() => 0 < this.messageListChecked().length).extend({ rateLimit: 0 });
@@ -279,7 +279,7 @@ class MessageUserStore {
 		uidForRemove = uidForRemove.map(mValue => pInt(mValue));
 
 		let unseenCount = 0,
-			messageList = this.messageList(),
+			messageList = this.messageList,
 			currentMessage = this.message();
 
 		const trashFolder = FolderStore.trashFolder(),
@@ -342,7 +342,7 @@ class MessageUserStore {
 
 				setTimeout(() => {
 					messages.forEach(item => {
-						this.messageList.remove(item);
+						messageList.remove(item);
 					});
 				}, 350);
 			}
@@ -357,10 +357,7 @@ class MessageUserStore {
 		}
 
 		if (this.messageListThreadUid()) {
-			messageList = this.messageList();
-
 			if (
-				messageList &&
 				messageList.length &&
 				!!messageList.find(item => !!(item && item.deleted() && item.uid === this.messageListThreadUid()))
 			) {
@@ -592,11 +589,11 @@ class MessageUserStore {
 						(message.folder !== selectedMessage.folder || message.uid !== selectedMessage.uid)
 					) {
 						this.selectorMessageSelected(null);
-						if (1 === this.messageList().length) {
+						if (1 === this.messageList.length) {
 							this.selectorMessageFocused(null);
 						}
 					} else if (!selectedMessage && message) {
-						selectedMessage = this.messageList().find(
+						selectedMessage = this.messageList.find(
 							subMessage =>
 								subMessage &&
 								subMessage.folder === message.folder &&
diff --git a/dev/Stores/User/Pgp.js b/dev/Stores/User/Pgp.js
index 516dc8e6f..08d2f7fdf 100644
--- a/dev/Stores/User/Pgp.js
+++ b/dev/Stores/User/Pgp.js
@@ -135,11 +135,11 @@ class PgpUserStore {
 
 		this.openpgp = null;
 
-		this.openpgpkeys = ko.observableArray([]);
+		this.openpgpkeys = ko.observableArray();
 		this.openpgpKeyring = null;
 
-		this.openpgpkeysPublic = ko.computed(() => this.openpgpkeys().filter(item => item && !item.isPrivate));
-		this.openpgpkeysPrivate = ko.computed(() => this.openpgpkeys().filter(item => item && item.isPrivate));
+		this.openpgpkeysPublic = ko.computed(() => this.openpgpkeys.filter(item => item && !item.isPrivate));
+		this.openpgpkeysPrivate = ko.computed(() => this.openpgpkeys.filter(item => item && item.isPrivate));
 	}
 
 	/**
diff --git a/dev/Stores/User/Sieve.js b/dev/Stores/User/Sieve.js
index c2b1ef06c..5e72c0da2 100644
--- a/dev/Stores/User/Sieve.js
+++ b/dev/Stores/User/Sieve.js
@@ -3,9 +3,9 @@ import ko from 'ko';
 class SieveUserStore {
 	constructor() {
 		// capabilities
-		this.capa = ko.observableArray([]);
+		this.capa = ko.observableArray();
 		// Sieve scripts SieveScriptModel
-		this.scripts = ko.observableArray([]);
+		this.scripts = ko.observableArray();
 	}
 }
 
diff --git a/dev/Stores/User/Template.js b/dev/Stores/User/Template.js
index 21fc7bf15..21fdb6e88 100644
--- a/dev/Stores/User/Template.js
+++ b/dev/Stores/User/Template.js
@@ -4,10 +4,10 @@ import ko from 'ko';
 
 class TemplateUserStore {
 	constructor() {
-		this.templates = ko.observableArray([]);
+		this.templates = ko.observableArray();
 		this.templates.loading = ko.observable(false).extend({ throttle: 100 });
 
-		this.templatesNames = ko.observableArray([]).extend({ throttle: 1000 });
+		this.templatesNames = ko.observableArray().extend({ throttle: 1000 });
 		this.templatesNames.skipFirst = true;
 
 		this.subscribers();
diff --git a/dev/View/Popup/Compose.js b/dev/View/Popup/Compose.js
index 0c59c262a..b0147e7c1 100644
--- a/dev/View/Popup/Compose.js
+++ b/dev/View/Popup/Compose.js
@@ -208,7 +208,7 @@ class ComposePopupView extends AbstractViewNext {
 			}
 		}).extend({ notify: 'always' });
 
-		this.attachments = ko.observableArray([]);
+		this.attachments = ko.observableArray();
 
 		this.dragAndDropOver = ko.observable(false).extend({ throttle: 1 });
 		this.dragAndDropVisible = ko.observable(false).extend({ throttle: 1 });
@@ -256,17 +256,17 @@ class ComposePopupView extends AbstractViewNext {
 				return result;
 			},
 
-			attachmentsInProcess: () => this.attachments().filter(item => item && !item.complete()),
-			attachmentsInReady: () => this.attachments().filter(item => item && item.complete()),
-			attachmentsInError: () => this.attachments().filter(item => item && item.error()),
+			attachmentsInProcess: () => this.attachments.filter(item => item && !item.complete()),
+			attachmentsInReady: () => this.attachments.filter(item => item && item.complete()),
+			attachmentsInError: () => this.attachments.filter(item => item && item.error()),
 
-			attachmentsCount: () => this.attachments().length,
-			attachmentsInErrorCount: () => this.attachmentsInError().length,
-			attachmentsInProcessCount: () => this.attachmentsInProcess().length,
+			attachmentsCount: () => this.attachments.length,
+			attachmentsInErrorCount: () => this.attachmentsInError.length,
+			attachmentsInProcessCount: () => this.attachmentsInProcess.length,
 			isDraftFolderMessage: () => this.draftFolder() && this.draftUid(),
 
 			identitiesOptions: () =>
-				IdentityStore.identities().map(item => ({
+				IdentityStore.identities.map(item => ({
 					'item': item,
 					'optValue': item.id(),
 					'optText': item.formattedName()
@@ -1106,7 +1106,7 @@ class ComposePopupView extends AbstractViewNext {
 						}
 					});
 				} else {
-					this.attachments().forEach(attachment => {
+					this.attachments.forEach(attachment => {
 						if (attachment && attachment.fromMessage) {
 							attachment
 								.waiting(false)
@@ -1221,7 +1221,7 @@ class ComposePopupView extends AbstractViewNext {
 	 * @returns {?Object}
 	 */
 	getAttachmentById(id) {
-		return this.attachments().find(item => item && id === item.id);
+		return this.attachments.find(item => item && id === item.id);
 	}
 
 	cancelAttachmentHelper(id, oJua) {
@@ -1428,7 +1428,7 @@ class ComposePopupView extends AbstractViewNext {
 			if (ComposeType.ForwardAsAttachment === type) {
 				this.addMessageAsAttachment(message);
 			} else {
-				message.attachments().forEach(item => {
+				message.attachments.forEach(item => {
 					let add = false;
 					switch (type) {
 						case ComposeType.Reply:
@@ -1464,15 +1464,15 @@ class ComposePopupView extends AbstractViewNext {
 	 */
 	isEmptyForm(includeAttachmentInProgress = true) {
 		const withoutAttachment = includeAttachmentInProgress
-			? !this.attachments().length
+			? !this.attachments.length
 			: !this.attachmentsInReady().length;
 
 		return (
-			!this.to().length &&
-			!this.cc().length &&
-			!this.bcc().length &&
-			!this.replyTo().length &&
-			!this.subject().length &&
+			!this.to.length &&
+			!this.cc.length &&
+			!this.bcc.length &&
+			!this.replyTo.length &&
+			!this.subject.length &&
 			withoutAttachment &&
 			(!this.oEditor || !this.oEditor.getData())
 		);
@@ -1528,7 +1528,7 @@ class ComposePopupView extends AbstractViewNext {
 	 * @returns {Array}
 	 */
 	getAttachmentsDownloadsForUpload() {
-		return this.attachments().filter(item => item && !item.tempName()).map(
+		return this.attachments.filter(item => item && !item.tempName()).map(
 			item => item.id
 		);
 	}
diff --git a/dev/View/Popup/ComposeOpenPgp.js b/dev/View/Popup/ComposeOpenPgp.js
index 48839e601..5f0e5c607 100644
--- a/dev/View/Popup/ComposeOpenPgp.js
+++ b/dev/View/Popup/ComposeOpenPgp.js
@@ -41,10 +41,10 @@ class ComposeOpenPgpPopupView extends AbstractViewNext {
 
 			submitRequest: false
 		});
-		this.encryptKeys = ko.observableArray([]);
+		this.encryptKeys = ko.observableArray();
 
 		this.addComputables({
-			encryptKeysView:  () => this.encryptKeys().map(oKey => (oKey ? oKey.key : null)).filter(v => v),
+			encryptKeysView:  () => this.encryptKeys.map(oKey => (oKey ? oKey.key : null)).filter(v => v),
 
 			privateKeysOptions: () => {
 				const opts = PgpStore.openpgpkeysPrivate().map((oKey, iIndex) => {
@@ -150,13 +150,10 @@ class ComposeOpenPgpPopupView extends AbstractViewNext {
 		}
 
 		if (result && this.encrypt()) {
-			if (!this.encryptKeys().length) {
-				this.notification(i18n('PGP_NOTIFICATIONS/NO_PUBLIC_KEYS_FOUND'));
-				result = false;
-			} else if (this.encryptKeys()) {
+			if (this.encryptKeys.length) {
 				aPublicKeys = [];
 
-				this.encryptKeys().forEach(oKey => {
+				this.encryptKeys.forEach(oKey => {
 					if (oKey && oKey.key) {
 						aPublicKeys = aPublicKeys.concat(oKey.key.getNativeKeys().flat(Infinity).filter(v => v));
 					} else if (oKey && oKey.email) {
@@ -170,9 +167,12 @@ class ComposeOpenPgpPopupView extends AbstractViewNext {
 					}
 				});
 
-				if (result && (!aPublicKeys.length || this.encryptKeys().length !== aPublicKeys.length)) {
+				if (result && (!aPublicKeys.length || this.encryptKeys.length !== aPublicKeys.length)) {
 					result = false;
 				}
+			} else {
+				this.notification(i18n('PGP_NOTIFICATIONS/NO_PUBLIC_KEYS_FOUND'));
+				result = false;
 			}
 		}
 
@@ -261,11 +261,10 @@ class ComposeOpenPgpPopupView extends AbstractViewNext {
 	@command()
 	addCommand() {
 		const keyId = this.selectedPublicKey(),
-			keys = this.encryptKeys(),
 			option = keyId ? this.publicKeysOptions().find(item => item && keyId === item.id) : null;
 
 		if (option) {
-			keys.push({
+			this.encryptKeys.push({
 				'empty': !option.key,
 				'selected': ko.observable(!!option.key),
 				'removable': ko.observable(!this.sign() || !this.signKey() || this.signKey().key.id !== option.key.id),
@@ -273,16 +272,14 @@ class ComposeOpenPgpPopupView extends AbstractViewNext {
 				'hash': option.key.id.substr(KEY_NAME_SUBSTR).toUpperCase(),
 				'key': option.key
 			});
-
-			this.encryptKeys(keys);
 		}
 	}
 
 	@command()
 	updateCommand() {
-		this.encryptKeys().forEach(oKey => {
-			oKey.removable(!this.sign() || !this.signKey() || this.signKey().key.id !== oKey.key.id);
-		});
+		this.encryptKeys.forEach(oKey =>
+			oKey.removable(!this.sign() || !this.signKey() || this.signKey().key.id !== oKey.key.id)
+		);
 	}
 
 	deletePublickKey(publicKey) {
@@ -390,7 +387,7 @@ class ComposeOpenPgpPopupView extends AbstractViewNext {
 				}).flat().validUnique(encryptKey => encryptKey.hash)
 			);
 
-			if (this.encryptKeys().length) {
+			if (this.encryptKeys.length) {
 				this.encrypt(true);
 			}
 		}
diff --git a/dev/View/Popup/Contacts.js b/dev/View/Popup/Contacts.js
index e0bc46974..b0bfbdc27 100644
--- a/dev/View/Popup/Contacts.js
+++ b/dev/View/Popup/Contacts.js
@@ -73,7 +73,7 @@ class ContactsPopupView extends AbstractViewNext {
 
 		this.contacts = ContactStore.contacts;
 
-		this.viewProperties = ko.observableArray([]);
+		this.viewProperties = ko.observableArray();
 
 /*
 		// Somehow this is broken now when calling addNewProperty
@@ -127,17 +127,17 @@ class ContactsPopupView extends AbstractViewNext {
 
 			contactsPaginator: computedPaginatorHelper(this.contactsPage, pagecount),
 
-			viewPropertiesNames: () => this.viewProperties().filter(propertyIsName),
+			viewPropertiesNames: () => this.viewProperties.filter(propertyIsName),
 
-			viewPropertiesEmails: () => this.viewProperties().filter(propertyIsMail),
+			viewPropertiesEmails: () => this.viewProperties.filter(propertyIsMail),
 
-			viewPropertiesOther: () => this.viewProperties().filter(property => property.isType(ContactPropertyType.Nick)),
+			viewPropertiesOther: () => this.viewProperties.filter(property => property.isType(ContactPropertyType.Nick)),
 
-			viewPropertiesWeb: () => this.viewProperties().filter(property => property.isType(ContactPropertyType.Web)),
+			viewPropertiesWeb: () => this.viewProperties.filter(property => property.isType(ContactPropertyType.Web)),
 
-			viewPropertiesPhones: () => this.viewProperties().filter(property => property.isType(ContactPropertyType.Phone)),
+			viewPropertiesPhones: () => this.viewProperties.filter(property => property.isType(ContactPropertyType.Phone)),
 
-			contactHasValidName: () => !!this.viewProperties().find(prop => propertyIsName(prop) && prop.isValid()),
+			contactHasValidName: () => !!this.viewProperties.find(prop => propertyIsName(prop) && prop.isValid()),
 /*
 			viewPropertiesEmailsEmptyAndOnFocused: () => this.viewPropertiesEmails().filter(propertyFocused),
 			viewPropertiesPhonesEmptyAndOnFocused: () => this.viewPropertiesPhones().filter(propertyFocused),
@@ -145,7 +145,7 @@ class ContactsPopupView extends AbstractViewNext {
 			viewPropertiesOtherEmptyAndOnFocused: () => this.viewPropertiesOther().filter(propertyFocused),
 */
 			contactsCheckedOrSelected: () => {
-				const checked = this.contacts().filter(item => item.checked && item.checked()),
+				const checked = this.contacts.filter(item => item.checked && item.checked()),
 					selected = this.currentContact();
 
 				return selected
@@ -155,7 +155,7 @@ class ContactsPopupView extends AbstractViewNext {
 
 			contactsCheckedOrSelectedUids: () => this.contactsCheckedOrSelected().map(contact => contact.id),
 
-			viewHash: () => '' + this.viewProperties().map(property => property.value && property.value()).join('')
+			viewHash: () => '' + this.viewProperties.map(property => property.value && property.value()).join('')
 		});
 
 		this.search.subscribe(() => this.reloadContactList());
@@ -243,7 +243,7 @@ class ContactsPopupView extends AbstractViewNext {
 
 	@command(self =>
 		!self.viewSaving() && !self.viewReadOnly()
-			&& (self.contactHasValidName() || self.viewProperties().find(prop => propertyIsMail(prop) && prop.isValid()))
+			&& (self.contactHasValidName() || self.viewProperties.find(prop => propertyIsMail(prop) && prop.isValid()))
 	)
 	saveCommand() {
 		this.viewSaving(true);
@@ -282,7 +282,7 @@ class ContactsPopupView extends AbstractViewNext {
 			},
 			requestUid,
 			this.viewID(),
-			this.viewProperties().map(oItem => oItem.toJSON())
+			this.viewProperties.map(oItem => oItem.toJSON())
 		);
 	}
 
@@ -322,7 +322,7 @@ class ContactsPopupView extends AbstractViewNext {
 	}
 
 	addNewOrFocusProperty(type, typeStr) {
-		const item = this.viewProperties().find(prop => prop.isType(type));
+		const item = this.viewProperties.find(prop => prop.isType(type));
 		if (item) {
 			item.focused(true);
 		} else {
@@ -393,7 +393,7 @@ class ContactsPopupView extends AbstractViewNext {
 			contacts = this.contactsCheckedOrSelected();
 
 		let currentContact = this.currentContact(),
-			count = this.contacts().length;
+			count = this.contacts.length;
 
 		if (contacts.length) {
 			contacts.forEach(contact => {
diff --git a/dev/View/Popup/Filter.js b/dev/View/Popup/Filter.js
index af7d13ece..84040c351 100644
--- a/dev/View/Popup/Filter.js
+++ b/dev/View/Popup/Filter.js
@@ -33,7 +33,7 @@ class FilterPopupView extends AbstractViewNext {
 		this.selectedFolderValue.subscribe(() => this.filter() && this.filter().actionValueError(false));
 
 		['actionTypeOptions','fieldOptions','typeOptions','typeOptionsSize','typeOptionsBody'].forEach(
-			key => this[key] = ko.observableArray([])
+			key => this[key] = ko.observableArray()
 		);
 
 		initOnStartOrLangChange(this.populateOptions.bind(this));
@@ -80,7 +80,7 @@ class FilterPopupView extends AbstractViewNext {
 
 		// this.actionTypeOptions.push({'id': FiltersAction.None,
 		// 'name': i18n('GLOBAL/NONE')});
-		const modules = SieveStore.capa();
+		const modules = SieveStore.capa;
 		if (modules) {
 			if (modules.includes('imap4flags')) {
 				this.allowMarkAsRead(true);
diff --git a/dev/View/Popup/Languages.js b/dev/View/Popup/Languages.js
index 35a966c3c..83e0d1248 100644
--- a/dev/View/Popup/Languages.js
+++ b/dev/View/Popup/Languages.js
@@ -17,11 +17,11 @@ class LanguagesPopupView extends AbstractViewNext {
 		this.fLang = null;
 		this.userLanguage = ko.observable('');
 
-		this.langs = ko.observableArray([]);
+		this.langs = ko.observableArray();
 
 		this.languages = ko.computed(() => {
 			const userLanguage = this.userLanguage();
-			return this.langs().map(language => ({
+			return this.langs.map(language => ({
 				key: language,
 				user: language === userLanguage,
 				selected: ko.observable(false),
@@ -39,9 +39,7 @@ class LanguagesPopupView extends AbstractViewNext {
 
 	setLanguageSelection() {
 		const currentLang = this.fLang ? ko.unwrap(this.fLang) : '';
-		this.languages().forEach(item => {
-			item.selected(item.key === currentLang);
-		});
+		this.languages.forEach(item => item.selected(item.key === currentLang));
 	}
 
 	onBeforeShow() {
diff --git a/dev/View/Popup/MessageOpenPgp.js b/dev/View/Popup/MessageOpenPgp.js
index 464cafabf..7761c04dc 100644
--- a/dev/View/Popup/MessageOpenPgp.js
+++ b/dev/View/Popup/MessageOpenPgp.js
@@ -20,7 +20,7 @@ class MessageOpenPgpPopupView extends AbstractViewNext {
 			password: '',
 			submitRequest: false
 		});
-		this.privateKeys = ko.observableArray([]);
+		this.privateKeys = ko.observableArray();
 
 		this.resultCallback = null;
 
diff --git a/dev/View/Popup/Plugin.js b/dev/View/Popup/Plugin.js
index 5bd9a9ac2..a4f88669b 100644
--- a/dev/View/Popup/Plugin.js
+++ b/dev/View/Popup/Plugin.js
@@ -24,10 +24,10 @@ class PluginPopupView extends AbstractViewNext {
 			readme: ''
 		});
 
-		this.configures = ko.observableArray([]);
+		this.configures = ko.observableArray();
 
 		this.hasReadme = ko.computed(() => !!this.readme());
-		this.hasConfiguration = ko.computed(() => 0 < this.configures().length);
+		this.hasConfiguration = ko.computed(() => 0 < this.configures.length);
 
 		this.bDisabeCloseOnEsc = true;
 		this.sDefaultKeyScope = KeyState.All;
@@ -40,7 +40,7 @@ class PluginPopupView extends AbstractViewNext {
 		const list = {};
 		list.Name = this.name();
 
-		this.configures().forEach(oItem => {
+		this.configures.forEach(oItem => {
 			let value = oItem.value();
 			if (false === value || true === value) {
 				value = value ? '1' : '0';
diff --git a/dev/View/User/MailBox/MessageList.js b/dev/View/User/MailBox/MessageList.js
index 36b784e5e..79145e364 100644
--- a/dev/View/User/MailBox/MessageList.js
+++ b/dev/View/User/MailBox/MessageList.js
@@ -141,7 +141,7 @@ class MessageListMailBoxUserView extends AbstractViewNext {
 				read: () => 0 < MessageStore.messageListChecked().length,
 				write: (value) => {
 					value = !!value;
-					MessageStore.messageList().forEach(message => message.checked(value));
+					MessageStore.messageList.forEach(message => message.checked(value));
 				}
 			},
 
@@ -152,10 +152,10 @@ class MessageListMailBoxUserView extends AbstractViewNext {
 
 			isIncompleteChecked: () => {
 				const c = MessageStore.messageListChecked().length;
-				return c && MessageStore.messageList().length > c;
+				return c && MessageStore.messageList.length > c;
 			},
 
-			hasMessages: () => 0 < this.messageList().length,
+			hasMessages: () => 0 < this.messageList.length,
 
 			hasCheckedOrSelectedLines: () => 0 < this.messageListCheckedOrSelected().length,
 
@@ -219,7 +219,7 @@ class MessageListMailBoxUserView extends AbstractViewNext {
 		addEventListener('mailbox.message.show', e => {
 			const sFolder = e.detail.Folder, sUid = e.detail.Uid;
 
-			const message = this.messageList().find(
+			const message = this.messageList.find(
 				item => item && sFolder === item.folder && sUid === item.uid
 			);
 
@@ -492,7 +492,7 @@ class MessageListMailBoxUserView extends AbstractViewNext {
 					case MessageSetAction.SetSeen:
 						folder = getFolderFromCacheList(sFolderFullNameRaw);
 						if (folder) {
-							MessageStore.messageList().forEach(message => {
+							MessageStore.messageList.forEach(message => {
 								if (message.isUnseen()) {
 									++cnt;
 								}
@@ -518,7 +518,7 @@ class MessageListMailBoxUserView extends AbstractViewNext {
 					case MessageSetAction.UnsetSeen:
 						folder = getFolderFromCacheList(sFolderFullNameRaw);
 						if (folder) {
-							MessageStore.messageList().forEach(message => {
+							MessageStore.messageList.forEach(message => {
 								if (!message.isUnseen()) {
 									++cnt;
 								}
@@ -675,7 +675,7 @@ class MessageListMailBoxUserView extends AbstractViewNext {
 			!this.messageListSearchDesc() &&
 			!this.messageListError() &&
 			!this.messageListEndThreadUid() &&
-			this.messageList().length &&
+			this.messageList.length &&
 			(this.isSpamFolder() || this.isTrashFolder())
 		);
 	}
@@ -864,7 +864,7 @@ class MessageListMailBoxUserView extends AbstractViewNext {
 
 	prefetchNextTick() {
 		if (ifvisible && !this.bPrefetch && !ifvisible.now() && this.viewModelVisible) {
-			const message = this.messageList().find(
+			const message = this.messageList.find(
 				item => item && !hasRequestedMessage(item.folder, item.uid)
 			);
 			if (message) {
diff --git a/dev/View/User/MailBox/MessageView.js b/dev/View/User/MailBox/MessageView.js
index 67d92385c..b4db76270 100644
--- a/dev/View/User/MailBox/MessageView.js
+++ b/dev/View/User/MailBox/MessageView.js
@@ -157,9 +157,9 @@ class MessageViewMailBoxUserView extends AbstractViewNext {
 		});
 
 		this.addComputables({
-			allowAttachmnetControls: () => this.attachmentsActions().length && Settings.capa(Capa.AttachmentsActions),
+			allowAttachmnetControls: () => this.attachmentsActions.length && Settings.capa(Capa.AttachmentsActions),
 
-			downloadAsZipAllowed: () => this.attachmentsActions().includes('zip') && this.allowAttachmnetControls(),
+			downloadAsZipAllowed: () => this.attachmentsActions.includes('zip') && this.allowAttachmnetControls(),
 
 			lastReplyAction: {
 				read: this.lastReplyAction_,
@@ -206,7 +206,7 @@ class MessageViewMailBoxUserView extends AbstractViewNext {
 
 		this.addSubscribables({
 			showAttachmnetControls: v => this.message()
-				&& this.message().attachments().forEach(item => item && item.checked(!!v)),
+				&& this.message().attachments.forEach(item => item && item.checked(!!v)),
 
 			lastReplyAction_: value => Local.set(ClientSideKeyName.LastReplyAction, value),
 
@@ -380,7 +380,7 @@ class MessageViewMailBoxUserView extends AbstractViewNext {
 	attachmentPreview(/*attachment*/) {
 /*
 		if (attachment && attachment.isImage() && !attachment.isLinked && this.message() && this.message().attachments()) {
-			const items = this.message().attachments().map(item => {
+			const items = this.message().attachments.map(item => {
 					if (item && !item.isLinked && item.isImage()) {
 						if (item === attachment) {
 							index = listIndex;
@@ -712,13 +712,10 @@ class MessageViewMailBoxUserView extends AbstractViewNext {
 		}
 	}
 
-	getAttachmentsHashes() {
-		const atts = this.message() ? this.message().attachments() : [];
-		return atts.map(item => (item && !item.isLinked && item.checked() ? item.download : '')).filter(v => v);
-	}
-
 	downloadAsZip() {
-		const hashes = this.getAttachmentsHashes();
+		const hashes = (this.message() ? this.message().attachments : [])
+			.map(item => (item && !item.isLinked && item.checked() ? item.download : ''))
+			.filter(v => v);
 		if (hashes.length) {
 			Remote.attachmentsActions('Zip', hashes, this.downloadAsZipLoading)
 				.then((result) => {
diff --git a/vendors/knockout/build/output/knockout-latest.debug.js b/vendors/knockout/build/output/knockout-latest.debug.js
index 999a758fe..73875a3de 100644
--- a/vendors/knockout/build/output/knockout-latest.debug.js
+++ b/vendors/knockout/build/output/knockout-latest.debug.js
@@ -814,14 +814,7 @@ ko.observable = initialValue => {
     observable[observableLatestValue] = initialValue;
 
     Object.defineProperty(observable, length, {
-        get: () => length in observable[observableLatestValue] ? observable[observableLatestValue][length] : undefined,
-        set: function(value) {
-			if (length in observable[observableLatestValue]) {
-				this.valueWillMutate();
-				observable[observableLatestValue][length] = value;
-				this.valueHasMutated();
-			}
-        }
+        get: () => null == observable[observableLatestValue] ? undefined : observable[observableLatestValue][length]
     });
 
     // Inherit from 'subscribable'
@@ -932,9 +925,11 @@ Object.setPrototypeOf(ko.observableArray['fn'], ko.observable['fn']);
 
 // Populate ko.observableArray.fn with native arrays functions
 Object.getOwnPropertyNames(Array.prototype).forEach(methodName => {
-    if (typeof Array.prototype[methodName] === 'function') {
-        if (["pop", "push", "reverse", "shift", "sort", "splice", "unshift"].includes(methodName)) {
+	// skip property length
+    if (typeof Array.prototype[methodName] === 'function' && 'constructor' != methodName) {
+        if (["copyWithin", "fill", "pop", "push", "reverse", "shift", "sort", "splice", "unshift"].includes(methodName)) {
             // Mutator methods
+            // https://developer.mozilla.org/tr/docs/Web/JavaScript/Reference/Global_Objects/Array/prototype#mutator_methods
             // Important: Do not add any additional functions here that may reasonably be used to *read* data from the array
             // because we'll eval them without causing subscriptions, so ko.computed output could end up getting stale
             ko.observableArray['fn'][methodName] = function (...args) {
diff --git a/vendors/knockout/build/output/knockout-latest.js b/vendors/knockout/build/output/knockout-latest.js
index ce162d7e8..8bdf53e04 100644
--- a/vendors/knockout/build/output/knockout-latest.js
+++ b/vendors/knockout/build/output/knockout-latest.js
@@ -4,86 +4,86 @@
  * License: MIT (http://www.opensource.org/licenses/mit-license.php)
  */
 
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+d){"string"!=typeof d&&(d=d.toString());d=a.a.Pa(d,n.ownerDocument);for(var f=0;f<d.length;f++)n.appendChild(d[f])}}})();a.vb=(()=>{function b(){if(e)for(var d=e,f=0,h;k<e;)if(h=c[k++]){if(k>d){if(5E3<=++f){k=e;a.a.Qb(Error("'Too much recursion' after processing "+f+" task groups."));break}d=e}try{h()}catch(m){a.a.Qb(m)}}k=e=c.length=0}var c=[],e=0,g=1,k=0,n=(d=>{var f=U.createElement("div");(new MutationObserver(d)).observe(f,{attributes:!0});return()=>f.classList.toggle("foo")})(b);return{cc:d=>
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diff --git a/vendors/knockout/src/subscribables/observable.js b/vendors/knockout/src/subscribables/observable.js
index 0d89c7c8f..ed2db3719 100644
--- a/vendors/knockout/src/subscribables/observable.js
+++ b/vendors/knockout/src/subscribables/observable.js
@@ -24,14 +24,7 @@ ko.observable = initialValue => {
     observable[observableLatestValue] = initialValue;
 
     Object.defineProperty(observable, length, {
-        get: () => length in observable[observableLatestValue] ? observable[observableLatestValue][length] : undefined,
-        set: function(value) {
-			if (length in observable[observableLatestValue]) {
-				this.valueWillMutate();
-				observable[observableLatestValue][length] = value;
-				this.valueHasMutated();
-			}
-        }
+        get: () => null == observable[observableLatestValue] ? undefined : observable[observableLatestValue][length]
     });
 
     // Inherit from 'subscribable'
diff --git a/vendors/knockout/src/subscribables/observableArray.js b/vendors/knockout/src/subscribables/observableArray.js
index c7d277a62..c43b75678 100644
--- a/vendors/knockout/src/subscribables/observableArray.js
+++ b/vendors/knockout/src/subscribables/observableArray.js
@@ -57,9 +57,11 @@ Object.setPrototypeOf(ko.observableArray['fn'], ko.observable['fn']);
 
 // Populate ko.observableArray.fn with native arrays functions
 Object.getOwnPropertyNames(Array.prototype).forEach(methodName => {
-    if (typeof Array.prototype[methodName] === 'function') {
-        if (["pop", "push", "reverse", "shift", "sort", "splice", "unshift"].includes(methodName)) {
+    // skip property length
+    if (typeof Array.prototype[methodName] === 'function' && 'constructor' != methodName) {
+        if (["copyWithin", "fill", "pop", "push", "reverse", "shift", "sort", "splice", "unshift"].includes(methodName)) {
             // Mutator methods
+            // https://developer.mozilla.org/tr/docs/Web/JavaScript/Reference/Global_Objects/Array/prototype#mutator_methods
             // Important: Do not add any additional functions here that may reasonably be used to *read* data from the array
             // because we'll eval them without causing subscriptions, so ko.computed output could end up getting stale
             ko.observableArray['fn'][methodName] = function (...args) {