it should not affect speed *cut*
Guess that you don't know that your changes have hitted a noticeable speed drop, no? (try Dead Dance on plain 0.133 and now and let me know...)
most regs have been added to PPU struct now. Dead Dance has lost <2% compared to rev.5355 (but I admit that I still haven't compared to 0.133)
my next task is to understand why window masking uses opposite values for color (it should not)...