Operating system: windows 10 x64
Graphics card: gtx 1050 (latest driver)
it was present in 2.79b but got more pronounced in 2.80 (x64 - 84c06e996a7a - jan 14)
it seems to me that every time i do something "unexpected" and blender has to draw a new screen from scratch, the viewport background seems to introduce a slight fog effect, reducing the draw distance but more importantly, brightening the background. the brightened background goes away after a maximum of what seems to be exactly 1 second. smaller changes result in a shorter time untill draw distance comes back and with small enough canges like 1 increment of rotation of the view either doesnt trigger it at all, or it goes away so quick that i can't notice it.
i'd like to note, that even if i don't release the middle mouse button, and even though i can see that blender has not yet applied anti-aliasing to the new screen, the effect still goes away after the screen has been still for about 1 second.
another oddity about this which is allmost unnoticeable, is that when this happens, the whole screen dimms a little bit.
All of theese things together mean that the screen is constantly flickering when i use the program in any way, inducing headache and nausea.
i tried to capture it with OBS but no matter how high i've set the quality, it seemed to mask the problem completely. allso lowering the screen resolution from 1980x1080 to 1366x768 masks it completely aswell.
it does it in any new or old .blend file. it triggers when i hover over any of the ui buttons except when i repeat the same movement over and over again, if i change anything about any object, or if i adjust the view in any way apart from subtle adjustments.