New
#11
Thank you for your thoughts Barman.
I assure you the slowdown is real not perceived.
Right after reboot if I, for instance pick an e-mail (local client) and click on "Reply" the New Message window comes up instantly. When the slowdown is evident it takes a good 2-3 seconds to display.
OR
I do a screen capture and open Paint and do a CTRL-V. If I click on File after a fresh boot the File Menu pops up instantly. If I do that when the slowdown is occurring, a black square the size of the File Menu pops up for half a second (sometimes more as the days wear on) and then the File Menu comes up.
Putting the mouse pointer on Save As at full speed causes the Save As menu to pop up instantly and when I click on jpeg, Windows Explorer appears instantly as well.
When the slowdown is in effect, putting the mouse pointer on Save As causes a black rectangle the size of the Save As SubMenu to appear for a second of two and then clicking on Jpeg will sometimes take 3-4 seconds to display Windows Explorer.
So it is not perception.
If I reboot the problem goes away until it gradually slows down again over hours or days.
It can't be my boot drive because it always solves itself after reboot (Corsair P1 NVMe 1TB).
It's almost as if there is a memory leakage problem.
I installed the latest Chipset Drivers yesterday (ASUS X570) but that did not solve the problem.
I also updated to the latest GPU drivers (AMD Radeon RX-580 4GB) to 20.09.2 (separate reboots).
My next test will probably be updating the BIOS from 1405 to 2607 but I resist doing that because the problem does not appear to be BIOS related (speed comes back after reboot).
I'll do a comparison of RAM usage in Task Manager and see what that tells me, if anything.