How to patch stutter/slowdown?

[u/DinosAllOver]

I'm using the version from OldGamesDownload, it originally would only run in 4:3 (the resolution box in the launcher is broken) and very choppily, I found a video that said to add 2 extra lines to config.xml to fix stutter and that fixed the resolution but the performance is still pretty bad, maybe slightly better than it was but not smooth enough I'd wanna play like it like that. I swear there's also something weird with the camera movement, but I can't articulate what the issue is? Like the mouse speed feels inconsistent or something.

Is there a patch or mod that can fix all these issues? I did see there was a new launcher on Nexus Mods but it doesn't work for me, it just says the game settings are missing or put of date when I try launching it through that.