Huge update on 3.19.14. Looks like a lot of good changes. Uhhh Tactical bacon. I don't think I need to say anything more. And then 3.22.14 for faster zombies. I like them, give a bit more challenge than the previous ones. They still clip through walls, but I'm assuming that will be fixed eventually.
I let nvidia optimize the game through the Geforce experience, and it plays the best it can for the type of card you have. I like just not having to monkey with it unless you want to fine tune it.