I mean my old desktop had some glitches with lag, but never that bad and I only noticed side-by-side with another system.
not sure if my laptop does it because I haven't dualboxed with another system in ages.
it was also more of an annoyance and minor, nothing that prevented actual play.
this lag just sounds awful, like the lag I used to experience when bittorrent was running and I was leveling thf...
(actually managed to time it right with a several second lag but still...)