Framerate drop when switching to spot view

Hello all,This is the weirdest thing I have experienced with FS2002. Whenever I use a non-default aircraft (such as POSKY 767-300 V3), the framerates are OK in spot view at the start of a flight but after I switch to cockpit view and stay there for a while and then switch back to the spot view, the framerate goes from about 13-15fps to 4-6fps. The only way I could fix the low fps is to use crtl-tab to get to the desktop and then return to FS2002. Anyone know a solution to this problem? I have re-installed and even reformatted my C: drive but the problem keeps occuring. Nothing else is running on my computer when I use FS2002 (I used ctrl-alt-delete to check and make sure).My system is as follows:HP Pavilion Celeron 600MHz10GB hardrive256MB RAMGeForce 2 MX400 64mb PCI cardWindows 98 SEI had a computer previously with the same specs but I didn't have this problem. Any help is appreciated.Thanks.James