RAF flush/sleep mode

[elwayman02]

Per @mixonic:

For perf, it would be great to decouple adding tracking to a buffer during rAF and flushing it

Would also be great if rAF didn't always need to be running. Like if this had a "sleep" mode.
In general the resolution of data here is very high, perhaps higher than needed in many cases.

These are both great suggestions that we should include in our implementation!

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