Honestly teacake, I would be surprised if problems like those don't clear themselves up before release.
The issue is that they haven't optimized the game for most people's graphics hardware yet. It's a bit like plopping someone who's never driven before behind the wheel of a car. You can tell them what to do, and they can figure out the basics, but they're by no means going to be perfect.
Once the optimize it, it'll be like the game's gone through driving school. Things will run better, and you'll have less chance of flying screaming into a ditch at 80 miles an hour and seeing your life flash before your eyes.
Wait. That metaphor didn't work out like I thought it would.