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For some time now, probably since installing Windows 10 1709 (fresh install, no upgrade) or maybe KB4058258 (see here and here), some applications are affected by massive GUI drawing slowdowns over the Windows uptime. The longer Windows was running, the slower the drawing gets. This usually happens after a week or two but it's not consistent. What normally appears in an instant then takes a second or two to render completely. I can literally watch Windows draw every single frame and border and control the UI consists of. And that can be quite a few. Windows 3 on an old 486 was never as slow.
The machine is an Intel Core i7 3xxx with 4 cores and hyper-threading. It has 16 GB RAM, a 256 GB system SSD and two other drives for data. Memory usage is almost never over 50%. I'm not doing much GPU related work except what apps do on their own (Firefox, Chrome, MS Office hw acceleration etc.).
The affected applications include at least Paint.NET (WPF, not MFC) and Beyond Compare 4 (unknown GUI toolkit), I'm not currently aware of others.
Restarting Windows fixes the problem for sure, but it will come back.
All Windows updates are installed (except feature upgrades). I have no other issues with this computer so the drivers should be okay. The same hardware has been used for previous Windows installations and this had never happened.
Does anybody know this behaviour? Or its cause? Or a fix? Windows 10 1809 will appear soon and I'll have to install that because I can't delay upgrades for more than a year.
ygoe
Posted 2018-09-04T18:56:59.543
Reputation: 1 597
What's your time-frame for this? Hours, days, weeks? What's your level of 'spare resources'? 128GB SSD with 2GB free & only 4GB RAM, or 4TB drive & 64GB RAM? As it stands, the question is just too broad. – Tetsujin – 2018-09-04T19:15:30.857
I've updated my question to include this information. – ygoe – 2018-09-05T08:15:38.200