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NeilandOrca
a7ffb244e4
hasCursorAgentReattachPayloadScreenSignal built a char-by-char copy of the entire reattach payload so it could read the last header plus 5000 chars. On a 2MB daemon snapshot that cost 17.5ms of synchronous renderer main-thread work — ~75% of what xterm then spends parsing the same bytes — and the miss case paid it in full for a result that is always false. Two changes, both matching existing in-tree precedent: bound the scan to a 256KB tail (as the kitty tracker already bounds its own scan), and strip via the shared precompiled CSI_SEQUENCE_PATTERN instead of a hand-rolled loop, which is also faster in V8 because it copies spans rather than building a rope per character. 2MB snapshot, header hit 17.5ms -> 0.80ms (22x) 2MB snapshot, miss 8.7ms -> 0.52ms (17x) 200KB snapshot, header hit 1.5ms -> 0.62ms (2.4x) config/scripts/terminal-reattach-payload-scan-benchmark.mjs reproduces this and asserts every candidate agrees with the baseline before timing it. It also records a negative result: porting the daemon mouse mirror's includes() pre-filter to the kitty tracker makes reattach slower, because snapshots always contain the introducer. Adds guards for the two behaviours a future shortcut would silently break: a CSI-split header must still match, and a header behind the tail bound must not. Also byte-pins POST_REPLAY_REATTACH_RESET_KEEP_MOUSE, which shipped unpinned. Co-authored-by: Orca <help@stably.ai>