Question PlayerSendFrameStarted, FinishFrameRendering at ~5ms each, scene within performance guidel

Hi everyone,

I am optimising several scenes in my VR application at the moment, and having a difficult time tracking exact causes of some performance spiking. My scenes are at a consistent enough 72fps, but spiking to 60fps. The only culprits I can find are in PlayerSendFrameStarted and FinishFrameRendering. However, my scenes are well within the performance guidelines, so I'm uncertain what is causing the wait for the renderer. In a spike I am having ~20 SetPass calls, and ~30 Draw Calls, not exceeding 300k triangles.

This is on Quest 2 standalone. Any help is much appreciated.