docs(js): Add troubleshooting for client instrumentation hook warning (#14554)

Author: chargome

docs/platforms/javascript/common/troubleshooting/index.mdx

@@ -670,6 +670,14 @@ shamefully-hoist=true
     ```
 
   </Expandable>
+  
+  <Expandable permalink title="Client Instrumentation Hook - Slow execution detected">
+    Seeing this warning in your dev build might be misleading due to Next.js dev server internals.
+    
+    In case you are using Session Replay and experience performance issues with the client instrumentation hook, you can try lazy-loading session replay as described [here](https://docs.sentry.io/platforms/javascript/guides/nextjs/session-replay/#lazy-loading-replay).
+
+    If you want to init the SDK itself at a later point, this will result in tracing data loosing accuracy and errors could happen before the SDK is initialized. This should be a tradeoff you make based on your use case, although we recommend initializing the SDK as early as possible.
+  </Expandable>
 </PlatformSection>
 
 If you need additional help, you can [ask on GitHub](https://github.com/getsentry/sentry-javascript/issues/new/choose). Customers on a paid plan may also contact support.