Docs/perf best practices update

[dvryaboy]

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Change Description

Adds some more details to perf tips regarding reading directly from the backing object store, based on conversation in Slack [1][2]

[dvryaboy]

@talSofer and @itaiad200 , thank you for the feedback! I incorporated a few of your suggestions and explained my motivation/reasoning for a couple of the things you pushed back on. LMK what you think after reading the explanation. In terms of which of these things I hold on to strongly vs weakly, I have a moderate preference for keeping gcs-fuse and high level concept info in here even if it's duplicated elsewhere, and a low level of preference for organizing things the way I did but can be easily convinced to organize differently if my arguments didn't sway you.

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Closing this PR because it has been stale for 7 days with no activity.

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