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MoltenVK serializes the MSL compiles of pipelines that share a VkPipelineCache, and we create every pipeline with the same one, so our compile threads mostly waited on each other. On MoltenVK the in-memory cache only saves the SPIR-V to MSL conversion, under a millisecond. Wipeout Pure from a savestate on an M1, with no shader caches (Metal's own cleared too): rendering blocked on pipelines for 1.2s instead of 2.9s, longest single stall 0.3s instead of 1s. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>