actually i have 200+ fps in normal LOL and when i active the script i have 180 fps, so probably you have some kind of problem on your pc
that's because you have a 60hz monitor (maybe). Anyway if you have a sick monitor (144hz) you would notice the difference between 60 fps and 200 trust me.
i've actually have a 144 hz and in games like valorant you see the differences, go on youtube and see a comparison between 60 and 144 hz.