-To people griping about "stuttering". How much VRAM do you have? If you are running a 2gb GTX 770, and are getting stuttering, guess what? You have the settings too high. If you are running DSR from nvidia settings, lower resolution to 1920 x 1080. I'm running a GTX 970 at that resolution with everything on Ultra, shadows low, blur off. Game doesn't stutter. I also have 16gb of RAM and 4gb of VRAM. This game uses nearly 40% RAM when minimized, which would be nearly 80% with 8gb, and way beyond with 4gb. Before you go griping about your system not able to play it, go check what your system is actually doing. It's NOT their fault you have a 2gb card with 4gb of RAM.
Meh. I'm using an old GTX 560 Ti with just 1GB VRAM and I can play the game very well. Some stutters but I expected this from the start. With patch 1.05 it improved a lot. I have no delusions of running this game in ULTRA with my current settings. I just let the game choose the settings for me and then tone-down post-processing to low. I think VRAM is the culprit. When you don't have enough of it Witcher 3 is bound to crash.
Take for instance my monitor is tiny only at 1366*768 using a larger one would definitely kick my gpu's behind. I mean larger monitors taxes gpu resources too so ramping up the graphical settings will further strain your gpu and cpu thus more VRAM is used hence the crashing problems on some gamers.
Game's not perfect for everyone. So what works for me may not work for you.
CDPR just needs to find a way to optimize the game further.