Want to get into speedrunning this game, however, in some random spots in the first level, Harry seems to be running wayyyy too fast. The audio and dialogue is the normal speed, but my character speed seems really boosted. not sure how to fix this.

You need to download Dxtory and cap the fps to atleast 120 fps, otherwise your run won't be valid I believe.

Or just change the video to software render, so you can just rezise the game window :)