Gemma 4 31B

User reports Gemma 4 31B at 20.8 t/s generation and 123.9 t/s prompt processing on an M4 Max 64GB. Setup is ZINC on Metal with Q4_K_M, serial single-device inference with speculative decoding disabled; configured context is unknown. The headline Quick Chat run used 49 prompt tokens and 96 output tokens, with TG 20.82[20.64,21.14] and PP 123.9[119.2,124.4] t/s as medians of three runs; these are short inputs, not long-context benchmarks.