From 53dc68a31dfeca704d2a5864f2db2dd8f0cd67fa Mon Sep 17 00:00:00 2001
From: Devan Buggay <devanb@meta.com>
Date: Thu, 2 Oct 2025 07:21:18 -0700
Subject: [PATCH] Don't flash the performance monitor there's no metro
 connection (#54019)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/54019

Currently the performance monitor flickers on boot if there's no metro connection. This change checks first if we have a packager before enabling the monitor.

No metro connection:
{F1982423105}

Metro connection:
{F1982423112}

Changelog: [Internal]

Reviewed By: shwanton

Differential Revision: D83701372

fbshipit-source-id: d099880d3ab509942a937a6bde11ebdde13450cd
---
 .../com/facebook/react/devsupport/DevSupportManagerBase.kt  | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevSupportManagerBase.kt b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevSupportManagerBase.kt
index 50e67445414..b3bec4749f7 100644
--- a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevSupportManagerBase.kt
+++ b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevSupportManagerBase.kt
@@ -567,8 +567,10 @@ public abstract class DevSupportManagerBase(
       perfMonitorOverlayManager?.let { manager ->
         reactInstanceDevHelper.inspectorTarget?.addPerfMonitorListener(manager)
       }
-      perfMonitorOverlayManager?.enable()
-      perfMonitorOverlayManager?.startBackgroundTrace()
+      if (isPackagerConnected) {
+        perfMonitorOverlayManager?.enable()
+        perfMonitorOverlayManager?.startBackgroundTrace()
+      }
       perfMonitorInitialized = true
     }