Hey yall, so I wanted to try speedrunning for the first time and I wanted to try Portal as my first game.

I watched the first 2 videos on how to setup Portal to be able to speedrun it, I downloaded SourcePack just as described, Livesplit and the latest speedrun_addonv0.0.5.1.

Everything was done like in the video and as I get into the game with the Portal.bat file everything is fine until I move my mouse even slightly and the game pretty badly stutters, I tried starting the run anyway and see if it was just a bug in the main menu but nope. After doing speedrun_start or whatever the console command was, it still was stuttering upon mouse movement.

I tried turning off Livesplit just in case that was the problem, I tried deleting the windowed and borderless commands in the .bat file, even all the lines apart from the ones that launch the game.

Done some googling for the problem, only a couple of people seemed to have the same problem but no fixes since this doesn't seem to be a thing that most people get.

If anyone has a fix pls let me know I really would want to try speedrunning :(

Thanks in advance.

PS: The video I watched: