Exactly the same here.
Have been running DisplayLink for more than a year now without any problem or noticable lag. But since a week or so I too experience extreme lag when browsing. My system is a late 2009 MBP with Windows 7 SP1 x64 (latest updates applied). On latest DL driver (6.1.35912). Graphics card is Nvida M9400. Aero is enabled. Monitors are two Samsung Syncmaster P2450H.
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