Actually, the game can run thousands of scripts at the same time without any problem. The easiest way to see it is to open the first automatic save performed by Alternate Start with ReSaver, for example. How many active scripts do you have? I have 67 in this save and more than 100 others times and I never had any problem when starting a new game. The only real problem comes from what the scripts do. You can execute 100, 200, 300, 500, 1000 ... scripts that, apparently, are INTENSIVE