FSX : 2d panels on second monitor and framerates

Hallo all,Bought FSX a few days ago and installed it on my notebook and activated it without any problem.Main notebook specs : Acer Aspire 9500 with Intel Pentium M 760, 1 GB RAM and Ati Mobilty Radeon X700 PCIe with 256 MB VRAMI have connected to this notebook a second monitor (15", 1024x768) using an USB2VGA convertor (Sitecom CN-105).I have set the display/scenery sliders such that if I start FSX with the Cessna 172 in 2D and full screen on the primary monitor without undocking any panel, that I reach most of the time the set upperlimt of 20 fps. So far, so good. BUT, if I undock the 2D panel and move it to my second monitor, the framerate drops to 2-3 fps.I did the same test with the B737-800 with the same result. It does not make any difference wich 2d panel I undock and move to the second monitor and the framerate drop looks like directly related to the part of the second monitor screen that is occupied As I have also FS9 installed on this notebook I could do the same test with the previous version.In that case, only using the primary monitor I get the set upperlimit of 40 fps AND it keeps at 40 if I undock and move 2d panel(s) to the second monitor.!!! Can anybody tell if the above result with FSX means that you need also high-end 3d videocards for undocked 2d panels on a second monitor or did I miss to adapt a certain setting. If you indeed need a high-end videocard for 2d panels, please give a short explanation. Thanks in advance for any reply. See you, Jan Arkesteijn