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# llama.cpp

1 article

 [![How a paravirtualized Metal device reporting Apple GPU family 5 makes llama.cpp disable its simdgroup matrix kernels, and the throughput that returns when the guest reports family 9](https://umesh-malik.com/blog/fix-slow-llm-inference-macos-vms-cover.png)

LLM Engineering • Aug 11, 2026

### Fix slow LLM inference in macOS VMs: 12.6 → 207 tok/s

LLM inference in macOS VMs collapses to 12.63 tok/s because the guest reports GPU family 5 and llama.cpp drops its matrix kernels. The check, and its limits.

9 min read

Read more →](https://umesh-malik.com/blog/fix-slow-llm-inference-macos-vms)