Well, I fucking called that "attack" pretty much to a T.
From what I can tell, that injected script was on the site for at least 28 hours. There were
hundreds of complaints in that timespan.
Oddly, it was fixed mere minutes after I posted here that I thought NeoGAF was compromised, and Demi posted that there was a pop-under javascript on the site causing the issues.
I think this is much worse than EviLore is making it out to be. Oh, and

at the slowdown being from the ISP provider. Get hacked and lie about it bro.