If you've got RTX 5090, maybe try ninfer (https://github.com/Neroued/ninfer). Folks over on /r/localllama have been reporting wild prefill/token gen speeds with ninfer (NVFP4; 256k ctx).
https://github.com/Neroued/ninfer/blob/master/docs/performan...
Category MTP3 stochastic sampler DFlash stochastic sampler DFlash greedy Code 1/15 natural stops; 0/15 prompt-complete 2/15 natural stops; 0/15 prompt-complete 0/15 natural stops Story 9/15 natural stops; the nine Chinese outputs pass requested division and minimum length 8/15 natural stops; the eight Chinese outputs pass requested division and minimum length 10/15 natural stops; five Chinese dialogue outputs are under length Translation 15/15 natural stops; 15/15 pass structural checks 15/15 natural stops; 15/15 pass structural checks 15/15 natural stops; 15/15 pass structural checks Structured 0/15 satisfy the requested complete record/script contract 0/15 satisfy the requested complete record/script contract 0/15 satisfy the requested complete record/script contract
And on my "own" "quick" benchmark, it's slower than vllm.