First of all make sense to mention that Profiler worked months ago when I used 2019.3. After I migrated to 2020.1 about a week ago I tried to profile the app but that was absolutely impossible. on iOS after attaching the profiler app FPS drops to 1-5, and after 5-10 seconds the app freezes. XCode throws the exception "BAD_ACCESS". It also says: Code (CSharp): UnityFramework was compiled with optimization - stepping may behave oddly; variables may not be available If XCode debugger is not running and only Unity Editor attached to the app, it just crashed after 5-10 seconds. on Android happens the same scenario. LogCat spamming allocation messages. The only way I found I can somehow profile the app is to use Memory Profiler making snapshots. That' all - no other way to get CPU profiling data. Note - it's just UI based application, no heavy elements like 3D assets and huge textures. How to solve it? Is it a Profiler bug?