Graphics start lagging when I go AFK for ~2+ mins

[DarylDixon]

Apologies in advance if this isn't the right forum, I don't know where else to ask this..

Recently, when I don't touch my mouse/keyboard for about 2 minutes or so, my graphics start lagging really bad. It's like everything on my monitor suddenly goes from 60fps to 3fps. This is very annoying if I'm trying to watch something on Netflix, or during lengthier cutscenes in games. And it happens everywhere, even on my desktop (when I was updating my drivers, I could see from accross the room that the loading bar was stuttering and it went back to moving smoothly when I got back to my pc).

When I move my mouse when it happens, it quickly goes back to normal. However, when I wake my pc up from sleep mode the stuttering is permanent and I have to reboot to get rid of it. I have no idea what causes it, I'm not that tech savvy so the only thing I can think of is my gpu, since stuttering tends to happen when I don't update it's drivers.

So far I tried rebooting, updating my drivers, and doing a clean reinstall of said drivers. Nothing helped. I'm going to do some virus scans after another reboot, though I doubt that could be the culprit. I'm going to clean my PC on the inside this afternoon I think, but I also feel like a little bit of dust can't be causing this?

My specs:
Dual monitors, Windows 10 Pro 64-bit
GeForce GTX 750Ti
AMD Athlon X4 750K Quad Core Processor, 8GB RAM
Some kind of Sharkoon 600w or 750w PSU, forgot which model
Gigabyte GA-F2A55M-HD2 motherboard

Some help would be very appreciated, even just a nudge to another forum if this isn't the right one!

Edit: I recorded some footage of it happening while gaming here. (Excuse the rude NPCs lol)

 

[DarylDixon]

Still looking for some help, it's getting increasingly more annoying 🙁 I can't even watch any movies/shows or listen to music without it stuttering every other minute..

 

[DarylDixon]

Nevermind, I think I fixed it. Turns out I had some malware on my PC that caused this after all. Something pretending to be taskhost.exe (the real taskhost process is always shown as taakbeheer.exe in my system and also isn't supposed to show up under "background processes", so I noticed that was off) and something called idlemonitor.exe. No clue what they actually did or how I got them, though. I uploaded a HitmanPro log here, if anyone's interested.