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* perf(display): encode linear documents for the screen in parallel CanvasDisplay::texture_buffer (every CPU-path canvas upload of a linear document, which every 32-bit document is since #3792) and to_rgba8's sRGB encode ran one pixel at a time on one thread. Both now split the pixels into 16K-pixel pieces across rayon off wasm; results are bit-identical. 24 MP linear document, median of 5 (22-thread laptop, dev profile): - texture_buffer: 348.5 ms -> 29.6 ms - to_rgba8: 107.8 ms -> 10.6 ms Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01AbyXia7KGdFgbNjBeggY8J * perf(compose): quantize Buffer::to_rgba8 in parallel The plain 8-bit quantize behind the CPU canvas, previews, thumbnails and 8-bit exports ran on one thread. Split it into 16K-pixel pieces across rayon off wasm; results are bit-identical. 24 MP buffer, median of 5 (22-thread laptop, dev profile): 122.3 ms -> 11.9 ms Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01AbyXia7KGdFgbNjBeggY8J * perf(canvas): build canvas images in parallel, fused with the quantize display_image (CPU canvas updates, filter previews, the navigator, the crop pasteboard) quantized to RGBA8 and then ran egui's single-threaded ColorImage::from_rgba_unmultiplied over every pixel. The identity path now quantizes straight to Color32 in one parallel pass; the colour-managed path converts in parallel. Results are identical to egui's conversion. 24 MP buffer, median of 5 (22-thread laptop, dev profile): 50.9 ms -> 12.7 ms Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01AbyXia7KGdFgbNjBeggY8J --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>