diff --git a/desktop/flipper-ui-core/src/startFlipperDesktop.tsx b/desktop/flipper-ui-core/src/startFlipperDesktop.tsx
index 9f3f2c082..c6ac62d5b 100644
--- a/desktop/flipper-ui-core/src/startFlipperDesktop.tsx
+++ b/desktop/flipper-ui-core/src/startFlipperDesktop.tsx
@@ -123,6 +123,10 @@ class AppFrame extends React.Component<
     );
   }
 
+  componentDidMount(): void {
+    uiPerfTracker.track('ui-perf-root-rendered');
+  }
+
   componentDidCatch(error: any, errorInfo: any) {
     console.error(
       `Flipper chrome crash: ${error}`,
diff --git a/desktop/flipper-ui-core/src/utils/UIPerfTracker.tsx b/desktop/flipper-ui-core/src/utils/UIPerfTracker.tsx
index aa02ed792..6e74a4e26 100644
--- a/desktop/flipper-ui-core/src/utils/UIPerfTracker.tsx
+++ b/desktop/flipper-ui-core/src/utils/UIPerfTracker.tsx
@@ -11,6 +11,7 @@ import {getLogger} from 'flipper-common';
 
 type UIPerfEvents =
   | 'ui-perf-store-rehydrated'
+  | 'ui-perf-root-rendered'
   | 'ui-perf-everything-finally-loaded-jeeeez';
 
 class UIPerfTracker {