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The steps skipped bones with a zero weight. With weights that vary from vertex to vertex that branch mispredicts a lot, and it saves only a few multiplies. Now every weight is applied, with fused multiply-adds, as the vertex JIT does. Without the vertex JIT (as on iOS): Tekken 4.5% fewer cycles, God Eater 2.6%, God of War 1.7%. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>