I noticed this too, especially once you have your horse. I'd get stuck at the boundary between zones as if there was an invisible wall. Best guess is it's just server lag and/or maintenance stuff that coincidentally lines up with when you're later in the game and moving around the map more. I can't imagine a technical reason why Act III would be choppier than Act I.

Yepp, central EU hast pretty bad lags. usually it starts with some laggy input transfering into litterly stutter. Game itself runs fine with stable frametimes... if you have a chance try it at a less busy time.

There's times where I get some lag during prime time but it's not that bad in that regard.
The game does have several performance issues though. One is a vram issue where it fills your vram no matter what. During the betas I also had the performance degrade over time (not game progress), which required a restart of the game client to get back to full performance. I heard some people still experience this, so maybe this was just fixed through Linux drivers on my end instead. There's another issues however that is still ongoing: The game sometimes when you teleport or alt tab just degrades performance. You can usually fix this by toggling certain graphics option, like the shader quality back & forth or the smooth shadows off & on. I didn't notice a vram difference after that so I'm not sure if it's related to that or not but at least it is a quick momentarily fix until it happens again. Not sure if it works under Windows but I'd give it at least a try.

Edit: Skip the lag comment. It's been unplayable rubberbanding now.

My system chugged like hell in the last part of the game. Pretty much from the cinematic that you see from the trailer onwards. Don't know what about it but it didn't like it at.

(Ryzen 7 1700, RX5700XT, 32gb ram) How much ram do you have? Previously i was running the game on max with 16gb of ram and it was an absolute stutter fest. Noticed it was eating shitloads of ram and i was running out. Only way to fix was to close firefox and run the game on medium.

I have since acquired an additional 16gb to total 32gb of ram and i can play the game flawlessly at 100fps @ 1080p max settings even with firefox in the background. I hit about 22/32gb utilization when playing D4 on max with all my other background programs running.

You could just need more ram!