Like for instance, average of 59% of Mario 64's attract loop on a AMD Phenom II x6 1055T versus around 80% on a non Sandy Bridge Intel i7.
Or it could be AMD just sucks at emulation.
A little of column A, a little of column B. That sort of performance is known about with regard to MAME's threaded polygon renderer, I just wasn't sure if it would apply in this case given that the threads have more work to do than the Voodoo rasterizer in MAME, which I would have thought would help keep the main CPU thread from getting starved of work to dispatch, but I guess not!
