After swapping cases between my primary machine and the system I'm building, the primary started having issues making it virtually unusable. We're talking click start, click control panel, wait 9 minutes at Best to see results.
Initially, I could only get the machine to be somewhat functional in safemode, without networking, where I cleaned up a few things, a couple malware items, nothing major, but the moment i tried anything with network access, it bogged, and I'd noticed the lights on my switch are just pinned out on, so I rebuilt the tcp/ip stack, swapped network switches, cables, etc. Eventually I tried running safemode with networking, and used internet exploder in private mode, because any attempts with chrome resulted in BFRS, and was able to limp along.
I ran glasswire to take a closer look at things, and it didn't seem like there was much outside of norm. Network activity potentially ruled out, I looked at the drive read/write, and noticed that it was maxed out, at a really slow rate (like 10kb/s), with prefetch going nuts. I've disabled prefetch which seems to help, and I've uninstalled Chrome, because it seems like google processes were another big part of the problem.
This all still felt to me like the one thing I Can't do much about, which would be a dying drive, but scandisk had come up empty, no bad sectors, so I was still hopeful. On a random wild hair I replaced the sata cable, to no avail. Obviously, not really caring too much, because in the end I can always just nuke and pave, I've been kind of aggressive with tools, having used malwarebytes, adware removal tool, Hitman Pro, adw, spybot s&d, and ultimately combofix, followed by ccleaner to clean up the registry mess.
I've done everything I know to identify the problem, and can't for the life of me figure it out. I'd really rather not have to steamroll it. I've had to do that enough from numerous issues with the previous motherboard and a fickle stick of ram. Help would be, of course, greatly appreciated.