Windows 10: UAC background dimming sometimes causes a black background and slow/lagging animations overall

Hello,I have built a new PC and have an annoying issue.When I for example select Powershell in search and click "run as administrator" sometimes at random, instead of dimming the background image, it makes everything turn pitch black except the prompt window itself. After I deny or accept, it turns back to normal. And as I said it happens at radndom. Sometimes it is on the first try, sometimes the eleventh.And overall my windows has the problem, that sometimes scrolling through a website or opening new windows is not smooth and has stutters/lags.My PC has the following components:Ryzen 9 7950X

:)

 

background animation

I had de-activated my background animation a while back and now I want to re-activate my background animation bur forgot the procedure can someone help me please

 

STORE apps background processes cause keyboard shortcut lag (revisited)

Store-derived apps running as a background process cause a four-second lag when
keyboard input is used to launch any shortcut.

Calculator, as an example, spontaneously appears as a background process, or any store app may invoke STORE in the background, as seen in taskmanager. If either is shown there, a keyboard shortcut launch will lag. When launched manually, calculator does not
appear as a background process, but later - even when not used - it will eventually be listed.

At times there's a lag even without these processes running, but that is infrequent and may occur after rebooting. Lag can be banished by clicking the notification icon or killing the SHELL EXPERIENCE HOST process, which hints that it's related to the problem.
The process restarts spontaneously, but the lag doesn't return until, often, the next boot.

Some posts hint that this issue has been ongoing for years, but it first became evident here in Windows 10. Is there a way to prevent store apps from running in the background? Better still, is there a way to prevent the lag when they do?

 

Desktop background gone black after a few minutes of use on laptop.

Hello,

Desktop background and taskbar going black could be due to software conflicts.

We would like to know some information to better assist you with your concern:

• What troubleshooting steps have you done so far?
• Did you get any error messages or error codes?

In the meantime, we suggest that you try to check if the "Show Windows Background" option is turned on. Follow the steps below:

• Open Settings in the Start menu.
• Go to Ease of Access, then on the left side, click
  Other options.
• Turn on Show Windows Background and check if it works.

We will wait for your reply.