Game runs at 30 fps ever since the Dec 10 update, usually runs around 100-120 fps.
Saw that others who experienced the same problem determined that the issue is caused by the game running on the wrong GPU. Checked Task Manager and HWiNFO and both did show that the Intel iGPU was being utilized. Changed the GPU in the game’s settings and restarted the game. Game now seems to run on the Nvidia dedicated GPU, but shows low GPU utilization on Task Manager.
Disabled the iGPU in my device’s firmware to make sure that the game runs on the Nvidia GPU. After restarting, the game still runs at 30fps and Task Manager still shows the same low utilization. Updated the Nvidia driver and restarted the game, still the same problem. Other games run just fine so it doesn’t seem to be a hardware problem.
HWiNFO shows that the Nvidia GPU doesn’t exceed casual usage clock speeds and voltage when the game is running, both in menus and in the practice range. It’s as if the game isn’t telling the system to run the GPU on performance mode. Power and display settings show nothing out of the ordinary, Overwatch is set to “high performance” GPU power consumption as normal.