diff --git a/src/vs/workbench/api/node/extHostProgress.ts b/src/vs/workbench/api/node/extHostProgress.ts
index f4a17349909c37fa580ef845ea2523b71a09c74f..45eb184944a7dfffae5473f42fe72e7d774e5b39 100644
--- a/src/vs/workbench/api/node/extHostProgress.ts
+++ b/src/vs/workbench/api/node/extHostProgress.ts
@@ -11,7 +11,6 @@ import { IExtensionDescription } from 'vs/workbench/services/extensions/common/e
 import { Progress } from 'vs/platform/progress/common/progress';
 import { localize } from 'vs/nls';
 import { CancellationTokenSource, CancellationToken } from 'vs/base/common/cancellation';
-import { debounce } from 'vs/base/common/decorators';
 import { IProgressStep } from 'vs/workbench/services/progress/common/progress';
 
 export class ExtHostProgress implements ExtHostProgressShape {
@@ -69,22 +68,37 @@ export class ExtHostProgress implements ExtHostProgressShape {
 	}
 }
 
-function mergeProgress(result: IProgressStep, currentValue: IProgressStep): IProgressStep {
-	result.message = currentValue.message;
-	if (typeof currentValue.increment === 'number') {
-		result.increment = currentValue.increment;
-	}
-
-	return result;
-}
-
 class ProgressCallback extends Progress<IProgressStep> {
+	private throttledProgressStep: IProgressStep;
+
 	constructor(private _proxy: MainThreadProgressShape, private _handle: number) {
 		super(p => this.throttledReport(p));
 	}
 
-	@debounce(100, (result: IProgressStep, currentValue: IProgressStep) => mergeProgress(result, currentValue), () => Object.create(null))
-	throttledReport(p: IProgressStep): void {
-		this._proxy.$progressReport(this._handle, p);
+	private throttledReport(p: IProgressStep): void {
+
+		// Throttle progress over the duration of 100ms
+		if (!this.throttledProgressStep) {
+			this.throttledProgressStep = p;
+
+			setTimeout(() => {
+				this._proxy.$progressReport(this._handle, this.throttledProgressStep);
+
+				this.throttledProgressStep = void 0;
+			}, 100);
+		}
+
+		// If throttled, merge the progress step into the existing one
+		else {
+			this.throttledProgressStep.message = p.message;
+
+			if (typeof p.increment === 'number') {
+				if (typeof this.throttledProgressStep.increment === 'number') {
+					this.throttledProgressStep.increment += p.increment;
+				} else {
+					this.throttledProgressStep.increment = p.increment;
+				}
+			}
+		}
 	}
-}
\ No newline at end of file
+}