i kinda figured as much about the nes ntsc filter into a pc emu. yea as far as i know pce-cd emulation did have an impact on the cpu but it remains to be seen until it is ported into a new xbox release as far as the hu-card games goes the fixes that have been implemented for those should make a difference without a cpu hit. i know some games had some irq fixes IIRC, but some progress has been made on that front.
thanks for the answers madmab, hopefully at some point you can look into maybe updating the core, i have tried a little bit, but its a little over my head to be honest.
XT-