`render_page` copied every raster out of vello_cpu's pixmap with
`data_as_u8_slice().to_vec()`. That is a second buffer the size of the raster
(up to 256 MB for a 64 MP page), alive alongside the first for as long as the
copy runs. `Pixmap::take` hands over the pixel vector, and `bytemuck`
reinterprets its four one-byte channels as bytes in place: the same bytes, in
the same buffer.
On a 6182×8000 px page, peak RSS goes from about 425 MB to 246 MB and render
time from 102 ms to 81 ms. Pixels are identical: every page of #260's test
file, at two scales and as a tile, hashes the same before and after.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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