How can I verify if ubershaders are working on my system?

[Shadorino]

I do a clean install of Windows 10 every major update, so twice a year. And yeah, it is a drag, but I've become very good at it.
I have a bookmark list of every download page of my applications and drivers.
I also back up every app's config files when they have one, it saves time.
I backup my Steam folder too. Can't redownload 800 GB worth of games twice a year with a 4 Mb/s internet connection.
The rest I do it by hand.

But I'm not recommending you to do it this often, it's not for everyone. But considering that you've never done it since Windows 7, it really wouldn't hurt. It might solve your current problem, and others.

If that still doesn't do anything, the only way to truly rule out a Windows 10 problem, would be to try out a clean install of Windows 10 1703, then 1607, preferably on another drive, to not have to roll back to 1803 if that doesn't do anything. But that's… well, a huuuuuge drag.

And, the final solution, would be to toss your computer out the window and buy a brand new i5 or i7 7th or 8th gen CPU couple with a nice NVIDIA card.

Those are your options