Well, I think that's actually due to the ads. I've had ad blocker for a while now and noticed the slowness starting lately, so I disabled it and it was still just as slow for me. Then I tried uninstalling ad blocker and it was still just as slow. I think it's just the ads, themselves, that make it slower, and not necessarily the blocker. Or at least for me that's true. You'll notice that whether or not you have ad blocker, the status bar shows the page still loading ad stuff, not DiabloFans stuff.
Join the chat!
*goes to test*
Edit~
Lag's still the same for me. It's probably just my ISP or something. Blast it.
http://www.diablofans.com/forums/showthread.php?t=25970