The performance is pretty terrible for non-OffscreenCanvas reasons. There is low hanging fruit on the software filter pathways I can fix to make this usable on at least a powerful machine. That will land in another bug.
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The performance in the codepen demo is pretty terrible for non-OffscreenCanvas reasons. There is low hanging fruit on the software filter pathways I can fix to make this usable on at least a powerful machine. That will land in another bug. My changes had the potential to appear in this test case, as it stresses the pathways I added, but it barely shows up in my local profiling.