May as well jump in here instead of making a new post. I'm one of the lucky ones that has never had FPS issues. Was playing on a GTX 1080 low settings from Beta. Decent frame rates and the game ran smoothly.
Switch to 6900XT in February/March. I got the Direct X error message that's well documented. Switching off XMP fixed it for me. Game ran butter smooth for me. 150-200 fps all the time.
After season one patch my game ran terribly. Imput lag, stuttering etc. I reinstalled drivers and it looked to have worked. Then out of nowhere on Sunday I started to get huge frame rate drops. I don't run a counter in the game but could immediately feel the game wasn't running well.
Turning on an FPS counter confirmed that my FPS had fell through the floor. I had like 45-65 fps..... I've tweaked some settings and got it back to 80 plus or minus a bit but it's nowhere near where it used to be. I've noticed quite a few players saying they've had performance drop issues.
I should be getting a lot more frames than 80 fps running a 6900XT with an i9 10850K. They've definitely changed something.
Edit.
Should have mentioned I was running the exact same settings since Beta. Everything on low or switch off except mesh filtering set to ultra. I never botheredchanging the settings as it had no affect.
I also had my gpu underclocked with the max frequency reduced from 2600MHz to 2200MHz as the extra MHz produced only heat and no extra frames.