NVFP4 / INT4 tradeoffs: setup advice

[routeline23]

That matches what I was seeing. I ended up in about the same place using TensorRT-LLM.

I'd approach it in a boring order. On M3 Max, the easiest win is often to back off the aggressive settings and see whether the problem survives. A lot of these threads end up being one bad config plus a pile of conclusions drawn from it.

There are a few different conversations hiding inside this thread, so being explicit about the goal helps.