problem

I am using the FCEU and i am having 2 problems. 1. i can't figure out how to costumize the keys. 2. i find that the games pause a lot. do i need to clear out a chase or is it the fact that i only have 1.3 g remaining of free space? anyone that can help would be great.

To config the input, take a look at this thread

About the other problem, it dpeends mostly of your CPU speed, but I think it's mostly a video config problem because FCEU doesn't need a fast CPU (~300Mhz). Try the options on "Config" -> "Video" -> "Sync Method". Also lower bpp value should be faster, and lower res too.