If I enable HDR in the video settings then restart the game as prompted, whenever I’m moving the in-game mouse cursor (the white and yellow arrow) around (which appears very dull compared to other things btw), my frame rate (as reported by the in-game fps display) drops rapidly and the faster I move the mouse, the faster the fps drops and the lower it can drop to (it can get to 1fps and possibly lower if i keep rapidly flicking the mouse around). This includes the main menu (which I can cope with by just moving the cursor slowly, but it’s annoying) but also the comms wheel and hero select while in a match, which is much more of a significant problem and means that I cannot risk using it at all so I end up just disabling HDR completely.
The game itself plays fine other than that (a solid 60fps - all my GPU supports at this resolution) and looks lovely with the high contrast, but I seems to have some bug related to rendering the mouse cursor when HDR is enabled.
Video card: NVIDIA GeForce GTX 1050
Using 21:9 aspect ratio (3840 x 1080)
Monitor: Samsung Odyssey G9 49" G95T Curved DQHD, 240Hz, QLED Monitor