Issue with emulator game’s performance

So I’m having an issue with all of the games I’ve downloaded from Emudeck. They all open fine but as soon as they start properly the audio goes kind of like popping and the games are really jittery and laggy. I thought it might be a refresh rate issue but I checked and it’s set to max (60hz) and I also tried unticking ‘disable frame limit’ but neither made a difference.

If anyone knows what my issue is please can you explain for me how to fix it like I’m dumb please?

Thanks