Start latency outline

[MikeSpreitzer]

This PR adds a couple of end-to-end outlines, with a focus on latency.

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[MikeSpreitzer]

I still think that we should have some documentation and clarity about where the latency comes from in real end-to-end scenarios.

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[MikeSpreitzer]

I still think that we need a document like this.

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[MikeSpreitzer]

This Issue should, for now, be kept open.

[MikeSpreitzer]

The force-push to d680777 is a rebase onto main.

[MikeSpreitzer]

The force-push to 3d9e0c0 is a rebase onto main, so that we can graduate from stage B of #471 .

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[MikeSpreitzer]

This is still interesting.

[MikeSpreitzer]

The force-push to 5090fae is a rebase onto main.

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