I would suggest that just like Guitar Hero, the EASY level only brings 3 keys to press instead of 4. Sometimes the arrangement of the things to press feels a bit sloppy but we can edit all that so it's cool
I also wonder about the beta graphics, some of them looked nicer (like the Loading gfx)
Rockersucke, what accelerator do you have? Do you have an FPU?
It can't be my workbench config, I booted with the barebones system to test this.