When I load up, the game runs like there's severe lag even in single player. Then after only a few minutes of progressively running slower and slower, the game will crash. This happens every single time. Installing the specific 1.9 build of optifine did nothing, that time it even crashed while I was in menu, trying to downgrade any settings I could find to make it easier to run. 1.8 still runs completely fine.

I tried updating java, geforce and intel. None of those have helped. Neither has changing the allocated ram from 1 to 2.