Grzegorz MartensandClaude Opus 5.5 2fb88feaf7 M2.6: a JPEG pays for being read before its header is ...

Reading a JPEG's header was free, and it can be most of the file: a mask of
1 MiB of tables that disagreed with its dictionary, shared by 4,000 images,
took 101 s with none refused, and that time grows as the square of the file.
A JPEG now pays 4 steps a byte before its tables are parsed, on every path, and
a mask's header is read once. That is a bound and not a speed-up: the same
file of 4,000 images fits the allowance and still takes 97 s, and 12,000 stop
after 10,233 in 250 s.

A chain that can't run pays nothing for its pixels, and the docs say what past
the allowance isn't counted: LZW streams the image pass didn't read.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AmsdeUCdTaD72jkDw2pJKY

2026-11-01 01:57:39 +01:00

..

acrobat-features.toml

M2.6: a JPEG pays for being read before its header is

2026-11-01 01:57:39 +01:00