Terrible speeds with LM Studio? (Is LM Studio bad?)

I've decided to try LM Studio today, and using quants of Qwen 3.5 that should fit on my 3090, I'm getting between 4 and 8 tok/s. Going from other people's comments, I should be getting about 30 - 60 tok/s. Is this an issue with LM Studio or am I just somehow stupid? Tried so far: Qwen3.5-35B-A3B-UD-Q5_K_XL.gguf Qwen3.5-35B-A3B-UD-Q4_K_XL.gguf Qwen3.5-27B-UD-Q5_K_XL.gguf It's true that I've got slower ECC RAM, but that's why I chose lower quants. Task manager does show that the VRAM gets used too.