Slow running

I recently used downloader on my amazon fire TV stick to download Madden nfl Roms for various emulators in retroarch. Some crashed. Others would run very slowly and the audio cracked. What went wrong and how can I fix it?

Try it with a system specific emulator instead of the frontend. When your hardware isn't up to spec, retroarch is extra crap you don't need running.

Not entirely sure what you're trying to do. It's rather vague. That in mind, don't use garbage to run games. Even a full on modern computer and emulators have the odd incompatible and messed up performance running certain roms/iso's even to this day.