irisandClaude Opus 5
b0b91ad28f
Warming covers a settled message, so it did not reach the block a reply is still writing: that one was re-lexed at every delta, on the composing thread. Measured streaming a two-hundred-line Kotlin fence -- 211 lexes, 13.7 seconds across the turn, the worst 177ms -- for colours on text being replaced as fast as they were computed. A live reply's last segment now draws its code plain and takes its colours when the block freezes, which for a finished fence is as soon as the next block starts. The settle-time lex then happens in warm, off the drawing thread. Same fixture after: one lex of 374ms in warm, draw phase 1.51ms to 1.01ms per frame while streaming, and the fence coloured on screen once the reply settles. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>