Summary
User reports Qwen3 8B at 19.7 t/s generation and 223.8 t/s prompt processing on a Mac mini M4 with 32 GB unified memory.
Setup is llama.cpp b10929 with the Q4_K_M GGUF and Metal, all layers on the GPU, four CPU threads.
The figures are separate llama-bench tests (pp512 and tg128), each the mean of three repetitions at zero initial depth, not one 512-input/128-output request; at 8192 prefill depth generation is 16.1 t/s.