irisandClaude Sonnet
288853c094
IRIS_TODO.md's "Benchmarks" item: a message list of N wrapped-text rows (first-frame cost), scrolling it, and growing an input box above which the list must move rather than re-layout -- all as a plain, harness=false `cargo bench` binary (iris/benches/message_list.rs) since UiRenderState touches no GPU or window, chosen over criterion because every scenario here reduces to a count take_counters already answers exactly, and a new dependency wasn't worth it. Scroll (200 ticks) and the input-grow case (40 lines) are flat across N=100/1,000/10,000: LAYOUT.md's O(1) move chain holds. The many-images case (d) needs a real wgpu device, so it's a headless example (iris/examples/bench_images.rs) plus a new GpuTextures/UiRenderNode counter, take_image_bind_group_creates, mirroring take_counters. It found two real non-O(1) costs, recorded as new Fix items rather than redesigned: bind-group creation takes two frames to settle after a cold load instead of one, and appending a single image to an already-loaded 1,000-image list rebuilds all 1,000 existing bind groups (masks/move_offsets buffer growth triggers rebuild_image_bind_groups unconditionally). run-bench.sh wraps both. Numbers and commands are in IRIS_TODO.md. cargo fmt --all -- --check, cargo clippy --all-targets, and cargo test --workspace (19 passed) all clean; benches are not run by cargo test. Co-Authored-By: Claude Sonnet <noreply@anthropic.com>