I don’t think one patch should drop his fps by half. That doesn’t make sense. There was nothing major graphic wise or much changed in that patch, It was just a content patch, I doubt his pc just decided to run at half fps. As widely documented across the support forms there has been lots of issues with 8.3 even for people with higher end systems. (Lucky I’m not one of them)
8.3 is definiatly a mess on a technical side of things. Just read about the black flickering issue that’s still not fixed. The worst I’ve seen and I’ve been playing for 15 years.
8.3 Also came with a well documented memory leak that still persists for lots of people, There is proof on the forums if you look hard enough. (I’m guessing this is part of your freezing problem)
So no you’re older cpu isn’t the issue, The patch is. If it ran fine in the patches before 8.3 it should be working now. Sure there is a chance your PC might have some technical issue or driver issues however it’s not down to your actual cpu brand.
Don’t listen to random people saying hardware isn’t good enough, They end up just being parrots for the latest gen hardware, Even when you’re playing a game that is fine for your hardware. Next year the 2080ti won’t be enough for some people.