From patch 6.2 notes:

The following features have been implemented to improve graphics processing:
Graphics Processing Optimization
Frame rate when under higher GPU load has been improved.
Dynamic resolution has been implemented (Windows/PlayStation®4/PlayStation®5).
When the GPU is under heavy load and causing the frame rate to drop, the 3D resolution will be reduced incrementally to improve frame rate. This feature can be enabled under the Graphics Settings tab of the System Configuration menu.
* This feature cannot be applied in certain situations, such as when using group pose.
* This feature is still in its beta stage as of Patch 6.2. Its implementation is in preparation for further graphical improvements planned with the release of the next expansion. The functionality of this feature is subject to change.

Hopefully this helps and resolve the issue.. but I'm skeptical