Neat trick I just learned, if you use Firefox and AdBlock Plus: add a custom filter *.exelator.com. I also added *.exelerator.com just in case.

I'm on several vBulletin forums and noticed "Waiting on loadus.exelator.com" every time I tried to open a thread, especially when opening any of my subscribed threads. Added these filters and everything loads a LOT faster now.