What would you do if your non-Apple computer was having performance issues?

I'd say this. I haven't had a Windows desktop computer with serious problems since 2007.

I had a long string of Windows laptops that were basically OK from maybe 2013 to 2023 except for problems with USB that got progressively worse over time (for each machine.) I think some of them were were real hardware problems but I think also the USB 3 spec doesn't guarantee that you can plug in very many devices and have it work, it depends on the PCIe architecture inside the machine. That "ding" sound when a USB device disconnects from windows has traumatized me and I've turned it off anywhere where I can because it is like a gunshot to a Vietnam vet.

I found very little literature about other Windows laptops users facing these problems but endless posts by AppleCare frequent fliers who seem to spend their lives at the Genius Bar and getting their old defective laptops replaced with new defective laptops, I think Windows users just expect it to be all screwed up.

For a long time Windows has struggled with processes that suck down a lot of resources at boot time. At home it is things that do software updates and saturate my 2x20Mbps internet connection. At work it is the backup program that saturates my Ethernet.

Debug it? Swap some components? Good luck with that on that shiny closed box.