For the most part, BG1 (the original version) plays fine, but when I go to areas with a lot of water, like the coastal areas and the lighthouse, it slows down and stutters whenever the characters move. I can get through but it's irritating when it happens. Any idea how to fix it? I'm playing in EasyTutu if that helps.

Did you try to disable the character movement sounds? It can lower the performance of the game. Also you might want to check if it's any better with the 3D acceleration. You can enable it in the config panel under 2D & 3D Options section.

That fixed it, thanks! One other minor thing, no big deal if it can't be fixed, but I'm using the expanded palette from One Pixel Productions and every time I load my game my CHARNAME's hair changes to a different color other than the one I picked for him when I made him. I can change it back easily enough, I was just wondering if there was a way to keep it from changing when I load the game again. And whenever I play the game in a resolution other than native 640x480, the edges of the screen get cut off as though the game is slightly too big for it.

EDIT: I found fixes for both those other issues. Using Shadowkeeper to set the hair color makes it stay, and I've found that playing in a window using a fullscreen borderless gaming program fixes the issue with the edges of the UI getting cropped.