Very good, I got similar numbers on the PCB version
(the important section is 45 seconds into this video)
It's clocked at 3.5 Mhz, but I lose some performance sending pixels back over the USB.
I don't have any fixed hardware for the ALU, PC, IR, Acc, SR etc, so it takes about ~2.5 clocks (average) per 6502 clock.
So this Pacman demo is very close to the equivalent of real-time on an Apple 2.