I really don't know what happened so I'll just try to explain it

I normally got a really low fps when using optifine/shaders, but one time it just suddenly worked really well and got 60 fps. Now, I updated my geforce driver (which might be the problem) and it suddenly dropped to 20 fps again! I do really think that geforce experience did something to the settings which made it low fps, since before the fps dropped geforce experience didn't work.

I don't know what's happening anymore, this computer has a mind of it's own!