diff --git a/src/vs/base/common/event.ts b/src/vs/base/common/event.ts
index 90d768a6269b3fd5204b3ed5b72bfbbb0162333b..53ac6b535c7c3918bd6969a573ffcbc33ff63d08 100644
--- a/src/vs/base/common/event.ts
+++ b/src/vs/base/common/event.ts
@@ -403,9 +403,9 @@ export function anyEvent<T>(...events: Event<T>[]): Event<T> {
 	return (listener, thisArgs = null, disposables?) => combinedDisposable(events.map(event => event(e => listener.call(thisArgs, e), null, disposables)));
 }
 
-export function debounceEvent<T>(event: Event<T>, merger: (last: T, event: T) => T, delay?: number, leading?: boolean): Event<T>;
-export function debounceEvent<I, O>(event: Event<I>, merger: (last: O | undefined, event: I) => O, delay?: number, leading?: boolean): Event<O>;
-export function debounceEvent<I, O>(event: Event<I>, merger: (last: O | undefined, event: I) => O, delay: number = 100, leading = false): Event<O> {
+export function debounceEvent<T>(event: Event<T>, merger: (last: T, event: T) => T, delay?: number, leading?: boolean, leakWarningThreshold?: number): Event<T>;
+export function debounceEvent<I, O>(event: Event<I>, merger: (last: O | undefined, event: I) => O, delay?: number, leading?: boolean, leakWarningThreshold?: number): Event<O>;
+export function debounceEvent<I, O>(event: Event<I>, merger: (last: O | undefined, event: I) => O, delay: number = 100, leading = false, leakWarningThreshold?: number): Event<O> {
 
 	let subscription: IDisposable;
 	let output: O | undefined = undefined;
@@ -413,6 +413,7 @@ export function debounceEvent<I, O>(event: Event<I>, merger: (last: O | undefine
 	let numDebouncedCalls = 0;
 
 	const emitter = new Emitter<O>({
+		leakWarningThreshold,
 		onFirstListenerAdd() {
 			subscription = event(cur => {
 				numDebouncedCalls++;
diff --git a/src/vs/editor/common/services/modelServiceImpl.ts b/src/vs/editor/common/services/modelServiceImpl.ts
index 40b258d49ce59f05baed3af1961127dd8d17800b..f5b8c26b983ed4b316d909da3d1d971c5a862e26 100644
--- a/src/vs/editor/common/services/modelServiceImpl.ts
+++ b/src/vs/editor/common/services/modelServiceImpl.ts
@@ -275,7 +275,7 @@ export class ModelServiceImpl extends Disposable implements IModelService {
 	private readonly _onModelRemoved: Emitter<ITextModel> = this._register(new Emitter<ITextModel>());
 	public readonly onModelRemoved: Event<ITextModel> = this._onModelRemoved.event;
 
-	private readonly _onModelModeChanged: Emitter<{ model: ITextModel; oldModeId: string; }> = this._register(new Emitter<{ model: ITextModel; oldModeId: string; }>());
+	private readonly _onModelModeChanged: Emitter<{ model: ITextModel; oldModeId: string; }> = this._register(new Emitter<{ model: ITextModel; oldModeId: string; }>({ leakWarningThreshold: 500 }));
 	public readonly onModelModeChanged: Event<{ model: ITextModel; oldModeId: string; }> = this._onModelModeChanged.event;
 
 	private _modelCreationOptionsByLanguageAndResource: {
diff --git a/src/vs/workbench/services/configuration/node/configurationService.ts b/src/vs/workbench/services/configuration/node/configurationService.ts
index 6ae845d4b9601d1f7caec093b32b583431e760ff..e2e2d658a853f0afa1e559ef51b37dd770a2bb54 100644
--- a/src/vs/workbench/services/configuration/node/configurationService.ts
+++ b/src/vs/workbench/services/configuration/node/configurationService.ts
@@ -51,7 +51,7 @@ export class WorkspaceService extends Disposable implements IWorkspaceConfigurat
 
 	private workspaceEditingQueue: Queue<void>;
 
-	protected readonly _onDidChangeConfiguration: Emitter<IConfigurationChangeEvent> = this._register(new Emitter<IConfigurationChangeEvent>());
+	protected readonly _onDidChangeConfiguration: Emitter<IConfigurationChangeEvent> = this._register(new Emitter<IConfigurationChangeEvent>({ leakWarningThreshold: 500 }));
 	public readonly onDidChangeConfiguration: Event<IConfigurationChangeEvent> = this._onDidChangeConfiguration.event;
 
 	protected readonly _onDidChangeWorkspaceFolders: Emitter<IWorkspaceFoldersChangeEvent> = this._register(new Emitter<IWorkspaceFoldersChangeEvent>());
diff --git a/src/vs/workbench/services/decorations/browser/decorationsService.ts b/src/vs/workbench/services/decorations/browser/decorationsService.ts
index 1021a43442e02069ecfb7b5dda3848eb0592ff3c..cddc0eea7fb790d7080de8ec8aca279e0af2f83b 100644
--- a/src/vs/workbench/services/decorations/browser/decorationsService.ts
+++ b/src/vs/workbench/services/decorations/browser/decorationsService.ts
@@ -339,7 +339,7 @@ export class FileDecorationsService implements IDecorationsService {
 
 	private readonly _data = new LinkedList<DecorationProviderWrapper>();
 	private readonly _onDidChangeDecorationsDelayed = new Emitter<URI | URI[]>();
-	private readonly _onDidChangeDecorations = new Emitter<IResourceDecorationChangeEvent>();
+	private readonly _onDidChangeDecorations = new Emitter<IResourceDecorationChangeEvent>({ leakWarningThreshold: 500 });
 	private readonly _decorationStyles: DecorationStyles;
 	private readonly _disposables: IDisposable[];
 
@@ -347,7 +347,8 @@ export class FileDecorationsService implements IDecorationsService {
 		this._onDidChangeDecorations.event,
 		debounceEvent<URI | URI[], FileDecorationChangeEvent>(
 			this._onDidChangeDecorationsDelayed.event,
-			FileDecorationChangeEvent.debouncer
+			FileDecorationChangeEvent.debouncer,
+			undefined, undefined, 500
 		)
 	);
 
diff --git a/src/vs/workbench/services/extensions/electron-browser/extensionService.ts b/src/vs/workbench/services/extensions/electron-browser/extensionService.ts
index 09b3b891a8ac509f49c2cccc2515f07d08e53515..11032404f2040d02bffe5ce718217eff5d133aaf 100644
--- a/src/vs/workbench/services/extensions/electron-browser/extensionService.ts
+++ b/src/vs/workbench/services/extensions/electron-browser/extensionService.ts
@@ -306,7 +306,7 @@ export class ExtensionService extends Disposable implements IExtensionService {
 		this._extensionsMessages = {};
 		this._allRequestedActivateEvents = Object.create(null);
 
-		this._onDidRegisterExtensions = new Emitter<void>();
+		this._onDidRegisterExtensions = new Emitter<void>({ leakWarningThreshold: 500 });
 
 		this._extensionHostProcessManagers = [];
 		this._extensionHostProcessActivationTimes = Object.create(null);
diff --git a/src/vs/workbench/services/themes/electron-browser/workbenchThemeService.ts b/src/vs/workbench/services/themes/electron-browser/workbenchThemeService.ts
index e312eda08d30438aed9855e7a78cd02a202fa1d9..0531987c4bc80dd1205c9553f8d27e8b3a0492dd 100644
--- a/src/vs/workbench/services/themes/electron-browser/workbenchThemeService.ts
+++ b/src/vs/workbench/services/themes/electron-browser/workbenchThemeService.ts
@@ -103,7 +103,7 @@ export class WorkbenchThemeService implements IWorkbenchThemeService {
 		this.colorThemeStore = new ColorThemeStore(extensionService, ColorThemeData.createLoadedEmptyTheme(DEFAULT_THEME_ID, DEFAULT_THEME_SETTING_VALUE));
 		this.onFileIconThemeChange = new Emitter<IFileIconTheme>();
 		this.iconThemeStore = new FileIconThemeStore(extensionService);
-		this.onColorThemeChange = new Emitter<IColorTheme>();
+		this.onColorThemeChange = new Emitter<IColorTheme>({ leakWarningThreshold: 500 });
 
 		this.currentIconTheme = {
 			id: '',