- A full-size draft's time is its render plus the CPU time of the frame
that uploaded it (eframe's cpu_usage, Perf::host_frame_ms): render
times alone said 231 of 234 1:1 drafts fit 16 ms while no complete
update did (PR #1009 benchmarks).
- A drag whose full-size drafts take more than twice the budget drops to
0.6 after three of them instead of at its end (a refined mask ran at
190 ms a step for the whole first drag).
- Under a zoom window the hidden whole-frame draft is the 0.6 one, and it
is not timed (the frame's time there is the window's upload).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
