If it isn't:Try resetting your modemTry pinging the gateway of your ISP. Use ipconfig /all. Then ping XXX.XXX.XXX.XXX where XXX is the gateway of the isp listed by ifconfigcheck for adware/etcDef
I have done all of the above, and had the cable guy come out here to check the connection, everything is fine. Its the oddest thing, my netgraph spikes about every 15 seconds, yet my ping on the server shows my ping at a stable 65 or so. I went into mutant with no one there, and it wasn't as bad, but once someone joined it went back to being really lagged. At vanilla I get the same lag, only not as bad. I also get the OldFrame message pop up on screen, and when I do lag, it rarely shows the phonejack, just repeats the movement I am doing 3 times until it catches up (sucks when trying to jump somewhere ) I've noticed a couple other people getting the same lag, dunno if this is just the internet in general getting clogged or what....
Everyone was getting (and still is as of this writing) that lag today.