Performance issues

I’ve noticed since I updated my GOG version that I have performance issues where the game hitches and jerks throughout most levels and when I get on the map screen after something, it seems like its going to crash until after about ten to fifteen seconds, it comes back and the screen resets, and suddenly Azra’s coat can move and I can do something in the game. I thought it was with my computer, maybe something was running in the background, but I don’t see anything. It became a lot worse when I did a new game+. Lowering particle effects to almost nothing helps in battles, but not the map screen.