http://community.virginmedia.com/t5/Fibre-optic-broadband-cable/FIX-Those-lagging-in-World-of-Warcraft-and-possibly-other/td-p/166003

So over the last couple of days my game has been utterly terrible, unable to play and crying myself to sleep because i couldnt farm, i range blizzard twice and on the second attempt got this information.

Im not able to tell you this 100% works for people who arent on Virgin Media broadband, but this is an attempt to help all of you out there fix the rubber banding and lag.

I was told, after the issues were fixed to reset to 900 afterwards so hopefully this will work for you.