DeepSeek V4 Flash 284B (13B active)

User reports DeepSeek-V4-Flash-0731-MXFP4-MLX decode at 14.89 tok/s on an M3 Ultra 512GB, about 2.8x below the 41.7 tok/s the model card reports for this checkpoint at 23K context with native DSpark MTP. Setup is oMLX 0.6.4 with MXFP4 MLX weights, native MTP enabled with 3 draft tokens, 23,716-token prompt, no KV cache quant stated. MTP acceptance is 86-88% and prefill is 445.08 tok/s, but decode does not follow. User notes the same ~14-15 tok/s class on 0.6.3rc3 and 0.6.4, no swap or memory pressure, and that 0.5.4rc2 (the reference build) was not A/B tested.