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Our torperf graphs show mean over time. Great.

But how much of the time is spent in which phase of downloading? Torperf collects that data, but our metrics graphs don't use it.

Seems to me there are 3 main phases to a fetch:

1. Receive the connected cell.
2. Receive the first byte of the response.
3. Receive the last byte of the response.

Is it easy to show the torperf graphs as a layered graph of these three components?

This topic comes up because once we do #3890 (moved), I expect the middle phase to basically disappear.