We tried another optimization using Blue Noise, after trying it the correct way it didn’t give the most performance expected (another big texture lookup took out the advantage), but after using it as a mask at the overall coverage texture + the settings from the tests above we got:
4k - 46 FPS
1440p - 86 FPS
1080p - 128 FPS
the Blue Noise texture used was a 2k texture, so maybe do another test with a 4k texture and see how it changes the performance. It might worth later implement an automatic performance adjustment based on the current usage and resolution x camera’s position and movement speed while 4k got only 9% improvement, the other resolutions got 20%+ improvement and since the idea is to not render all pixels for the clouds, seems interesting, up to the point it start changing the aspect of the clouds.