Er, lag much?

[Pyronost]

First time Ive experienced server lag (or what I think is for the most part), and I was wondering if anyone else was getting popped with it. Ive been sitting at about 70-80 MS all day, and suddenly Im moving at walk speed instead of selo's for a good 10 seconds at a time. Mobs catch up, bard falls over. Ive tried it with 100 mobs, and Ive tried it with five, same result. So for now, Im ruling out lag due to my hardware. The ms tells me that my connection to the server is solid, so Im at a bit of a loss here.

Ideas/options? (Fyi, I was in OT, and it was raining. Far clip pane was at 0, all spell effects off, "other" (i.e., spell damage) filtered to a closed window, and everything else I could set to minimum, or off in the case of shadows.)

*Edit* And yes, the game it set to run on a single core. Never had this issue before.