If you can run higan at 100% speed, then ZSNES has more lag than higan does (due to double buffering, polling only once per frame, etc.) For me, the issue with

If you can run higan at 100% speed, then ZSNES has more lag than higan does (due to double buffering, polling only once per frame, etc.) For me, the issue with the OP is a) comparing to clone NES hardware, and b) it's subjective. Different people react differently to latency. The numbers I talk about may be largely estimated, but they're objectively real latencies that really do exist, even if you can't observe them personally. It's a very good thing if you can't. Makes gaming a lot more fun. Testing myself, I don't really detect a change in latency under emulation alone until I simulate adding about 75ms more than is already there. However, I did notice a problem when I moved from playing Ninja Gaiden Trilogy (I know, bad port) on my SNES to higan: all of my timed moves were failing (it's a game that requires pixel-perfect movements); but I adapted pretty quickly and was able to beat the game. But again, this is all subjective stuff, so it's not really adding to the technical discussion any.