diff --git a/src/vs/workbench/electron-main/bootstrap.js b/src/vs/workbench/electron-main/bootstrap.js
index 2522c0586cb87..fdcc94bbf0023 100644
--- a/src/vs/workbench/electron-main/bootstrap.js
+++ b/src/vs/workbench/electron-main/bootstrap.js
@@ -6,7 +6,7 @@
 /* global __filename, __dirname, global, process */
 
 // Perf measurements
-global.vscodeStart = new Date().getTime();
+global.vscodeStart = Date.now();
 
 var app = require('app');
 var path = require('path');
diff --git a/src/vs/workbench/electron-main/main.ts b/src/vs/workbench/electron-main/main.ts
index 9a6abb9d1eb15..9cbfe693e660e 100644
--- a/src/vs/workbench/electron-main/main.ts
+++ b/src/vs/workbench/electron-main/main.ts
@@ -244,9 +244,6 @@ function setupIPC(): TPromise<Server> {
 	return setup(true);
 }
 
-function setupMutex() {
-}
-
 // On some platforms we need to manually read from the global environment variables
 // and assign them to the process environment (e.g. when doubleclick app on Mac)
 getUserEnvironment()
@@ -255,7 +252,6 @@ getUserEnvironment()
 
 		return timebomb()
 			.then(setupIPC)
-			.then(ipcServer => { setupMutex(); return ipcServer; })
 			.then(ipcServer => main(ipcServer, userEnv));
 	})
-	.done(null, quit);
+	.done(null, quit);
\ No newline at end of file
diff --git a/src/vs/workbench/electron-main/windows.ts b/src/vs/workbench/electron-main/windows.ts
index 36f1729fc3518..35ebd34b5fe02 100644
--- a/src/vs/workbench/electron-main/windows.ts
+++ b/src/vs/workbench/electron-main/windows.ts
@@ -302,6 +302,17 @@ export class WindowsManager {
 		app.on('will-quit', () => {
 			storage.setItem(WindowsManager.windowsStateStorageKey, this.windowsState);
 		});
+
+		let loggedStartupTimes = false;
+		onReady(window => {
+			if (loggedStartupTimes) {
+				return; // only for the first window
+			}
+
+			loggedStartupTimes = true;
+
+			window.send('vscode:telemetry', { eventName: 'startupTime', data: { ellapsed: Date.now() - global.vscodeStart } });
+		});
 	}
 
 	public reload(win: window.VSCodeWindow, cli?: env.ICommandLineArguments): void {