if you're playing PC, it's because the port was a joke and part of the reason people are so on rockstar's ass about this one with how slipshod a job they did last time.
So much this.
What's worse is that it's not just limited to performance issues.
The best AA available is ENB's AA, which looks like utter stuff unless you spend hours setting it up. Furthermore, all the cutscenes are zoomed in, so you occasionally get a really ugly close-up of Niko's horrifying teeth. Don't get me started on what they did the car handling...
If they butcher GTA V as bad as they've done to IV, it'll probably start some kind of cyber stufffest unlike any ever.
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