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PSA for M5Ultra owners running LLMs: set your prefill step to 8192

Prefill step size affects both PP performance and your drafter fetching logits for MTP (affects dflash as well, mlx-vlm needs to be patched slightly to support chunked prefill for dflash). It also needs to be reasonably large to be able to fill all your cores but not overfill - otherwise it will re…

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  1. 2026-09-25 11:10 · r/LocalLLaMA
    PSA for M5Ultra owners running LLMs: set your prefill step to 8192

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