Qwen3.6 35B-A3B Q8_0 / Metal native PP4096 and separate TG128 / batch512

User reports Qwen3.6-35B-A3B Q8_0 at 81.2 t/s generation and 2324.6 t/s prompt processing on a Mac Studio with an Apple M3 Ultra and 512 GiB unified memory. Setup is llama.cpp with Metal GPU offload, Flash Attention on, F16 KV cache, 8 threads, and batch/ubatch 512/512; the Mac-only control arm uses one GPU. PP4096 and TG128 are separate synthetic tests, with TG128 starting from an empty context rather than generation after prefill. The article also reports a continuous 4096-input plus 128-output workload at 3.409 seconds, and a separate tuning pass at the same batch/ubatch gives PP4096 2323.37 and TG128 80.68 t/s.