Right click the map and pick Net Status.
The top bar, Variance, should be flat.
If you see a heart beat monitor lookin' contant spikes, same one over and over, that's something firin' off on your compouter. (anti-virus, spyware, Windows Update (geez turn that pig off), or any number of things)
You know, that's the only one I know actually... What does a jaggedy ish line all over the place mean? No rhyme/reason... hmmm...
Anyway, if you see a warper, and you check your net stats and the variance is FLAT, then it's probably not you.