Err... I haven't thought to check. My systems on my SSD, and I'm downloading stuff to my HDD... Can't imagine that being the cause..? :|
Yeah, I was thinking about Process Explorer. So I went ahead and downloaded it, and... It seems that the main culprit is in fact System and svchost... Now I just need to figure out *WHY* -_-', seems my HDD isn't the problem since the lag entirely stops once Steam starts writing to the disk and stops downloading, and it never reaches max bandwidth...
Sigh. I hate Windows. ;_;
Edit: LOOK AT THIS SHIT, DOGG. LOOK AT IT.
God damnit. -_-
Edit yet again; Tried downloading something to my SSD. Same god damn thing, and not the slightest issue with drive bandwidth.
Fuck me in the arse but fuck Windows ever-so-more.