I used to play a lot on GGPO with Windows 7. Even when just emulating games there would be some input lag unless you disabled the default Windows Aero Theme (to basically put it in a Windows XP kind of mode), then it worked fine although still not quite as smooth and lag free as using win XP.
I recently upgraded to Win 8, decided to buy KOF 13 steam edition. Load up training mode and yep, still get the same input lag (compared to console version). Looked at the Win 8 Personalisation settings, but it doesn’t seem like you can turn Aero off? I tried switching to the high contrast modes which seem reminiscent of XP mode; maybe it did something but its still not good enough.
Anyone have a similar setup/solution? I might just make an XP partition if I can’t figure it out… and yes sorry this isn’t really to do with the game, more my OS
on the plus side even with the added input lag though I can tell the online has been improved, although it’s still not perfect.
Peace