My experiences with windows not refreshing quickly or being drawn very slow are caused by:
- An application or a driver process is running in a higher task priority .....
- Windows is running out of memory and therefore swaps memory to virtual memory .....
That's clear and thank you for the list - but no, what I'm talking about is (was) specific to UE and believe me, I have not the slightest idea of what it could be. Of course I know trivial things and I went after this bug quite a bit, including task manager performance monitoring and killing processes one by one - but then it was very clear and very easy to see that the problem was UE itself. Just took me a while to believe it. Then it also took me a while to figure out (no, randomly pop into) what caused the problem.
It's silly, it sounds like it makes no sense. Yeah. I know. But there it was, my search string, and I removed it and the problem was gone. Then I put it back again and the problem appeared again. So you can imagine how surprised I was. And I knew it was something like seeing a UFO, knowing exactly what everyone will say + think
Okay, just wanted to share that.