I've been playing FO3 for some time now and I just purchased FO:NV Ultimate Edition. I am wondering if what is mentioned in post #2 of this thread applies to FO:NV as well?

http://www.gamesas.com/topic/1223213-game-crashes-all-the-time/

If anyone else has the issue that is listed in the posted link, the fix in post 2 does work and can be applied.

Well, that's strange. I'm kind of wondering your issue was actually solved by something else. As far as I'm aware, that fix for FO3 does nothing for this game. Oh well, I take it the game works, so

It was a little choppy before making the change. After that, everything is smoother and the graphics are better.