Custom Metal Engine Achieves 3.7x LLM Prefill Speedup on Apple M4
TheMoonMidas · x · 2026-09-01
Addressing the LLM prefill bottleneck, the author explores software-based optimizations on the existing Apple M4 silicon instead of waiting for hardware upgrades in the M5. By building a custom Metal engine, the author achieved a significant 3.7x speedup in kernel performance. The thread details the technical implementation and benchmarks.
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