Is your feature request related to a problem? Please describe.
Shaders are pretty heavy on gpu.

Describe the solution you'd like
Creating a toggle for fsr 2 or at least 1 would free some gpu resources for shaders

Describe alternatives you've considered
Resoluution Scalers could do the same buut with higher quality hits.
Additional context
This would allow more people to use shaders and give parity with the resolution scaler of optifine.

duplicate of #1637