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Intermittent Performance Spikes, high time in Manipulators

I’m seeing random performance spikes, where FPS will drop from 50 to around 10. Manipulators and MainThread will show 80+ms. This will continue for around 10-30 seconds, then FPS suddenly improves. This isn’t always back to full speed, there seems to be an intermediate state (for me it was 25-30 FPS). It will sometimes jump between the 3 states a few times (10-30 seconds each) until finally getting back to normal speed. The switch between these states is sudden and obvious, both in the…