They think there may now be an incompatibility between certain GPUs and the game. Also the frame limiter they put in for no reason is a big part of the issue. They're working on a solution for it, but idk when that'll come. Could be later today, could be tomorrow, could be tuesday.

There's a workaround solution out there that's working for some, but not me personally. If you have a monitor that's over 60hz, (let's say 144hz) you can create a custom resolution and set the refresh rate to 90hz, and that could work. You could also try running the game in DX9 for now.