Summary
User reports Qwen3.8-Flash-Next at 121 prompt t/s and 12 generation t/s on an M1 Max 64GB.
Setup is MLX with oQ4e quant, 6-bit KV cache, 50% expert offload and MTP on.
A later fp16 build of the same model gave OOM errors and, at 20% expert offload, only 90 prompt t/s and 6 generation t/s; the user asks whether the model or the settings are at fault.