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Pressing F8 while playing a game slows everything down, but even after I shut the program down and restart, nothing speeds it back up.

What does F8 do and how do I fix it?

So why are you pressing F8 in the first place? 0_o Also whatever the key does (don't know...) it would have no effect after you restarted the emulator so your speed problems lie elsewhere.

F8 is supposed to take a screenshot or "snap" and put it in the snaps folder, could be failing to do it but it's very weird it's slowing everything down.
Are you sure you don't have other program that's responsible for the slowdown instead? You could try and check by opening the task manager and see if any other process is using a lot of CPU time when that happens.

As for fixing... don't press it?