Buddyboss App Performance Enhancement

I'm running an e-learning site on the Buddyboss App (built with Flutter and React Native), and the app's speed is causing inconvenience to our customers.

Issues:
- Delay in initiating and sending Live messages
- Slow video uploads in Activity Feed and Forums
- Lagging video playback (Vimeo videos play smoothly)

I need an expert to identify the root causes of these performance issues and suggest improvements. The investigation should focus on:

- Network environment: Communication speed and latency between the app and the server
- Server: Processing capability, load, database, optimization status of the Rapyd server
- App: Code, plugin conflicts, cache, version compatibility
- Videos: Encoding format, size, resolution, playback compatibility

Deliverables:
- Root cause analysis report
- Improvement proposal
- Performance measurement results

Tools I expect you to use:
- React Native
- UXCam
- react-native-performance
- Embrace
- Instruments (iOS), Android Studio Profiler (Android)
- Browser's developer tools

Other:
I will provide all necessary information and access rights for the investigation. Depending on the outcome, I may hire you for implementing the suggested improvements.