I benchmarked Unsloth's Qwen3.6-27B NVFP4 on 1x/2x 5090s. MTP is great until it really isn't.

Explain Like I'm Normal

Independent testing of Unsloth's Qwen3.6-27B quantized to NVFP4 reveals that speculative decoding (nspec=3) provides massive gains for single users on 5090 GPUs. However, these performance wins evaporate under heavy batching or large context loads, where hardware constraints eventually cause Multi-Token Prediction to actually slow down generation.