Google how to use google as your DNS host lookup. Makes pretty much everything faster, although I'm not entirely sure if it has an effect on ping as well (IT guy said it does).
I don't think anybody prone to warping should be flying at all, and if they repeatedly fly knowing full well they are warping is pretty much a downright exploit.
On the other hand, if you're playing MWLL in a college dorm wi-fi hotspot, don't complain about people warping. I don't pay an extra $20/mo of bandwidth for nothing. I don't cater my own gameplay experience to people with bad connections. No broadband users ever gave me an easier time in MW3 while I was on 56k.