Video card curio

I have a question re video cards (in general) My current card is a 32mb ATI M4 Mobility (AGP x4) equipped with the latest drivers. I run my notebook at a window/desktop resolutuion of 1400x1050x16, as I dislike scrolling and prefer the smaller, but a lot sharper text/fonts etc. The notebook is a Dell Inspiron 8000/P3 600/256 ram/Win98SE. I used to run FS98 on this machine with great results.I noticed that with FS98, when I went from window to F/Screen mode, my frame rates at least doubled (I had Full screen settings at 1400x1050x16) I then bought FS2000 and now FS2002, but notice that frame rates do not alter one iota between Window mode and fullscreen mode (same resolutions as FS98) Infact in window mode the image is HEAPS clearer. I have the "enable hardware acceleration" button selected. These two shots are at identical resolutions. The active aircraft is the SA777(centre), the "Singapore Airlines" logo is out of focus and if I go down in resolution to say 800x600 in fullscreen the aircraft company livery is actually unreadable. This applies to all aircraft at any airport. So what is the point of acceleration? I also notice that if I deliberatly shrink the window size, frame rates do not alter either, whereas they did in FS98. Are my settings wrong/my card faulty or is this typical of all/most video cards? Thanks for any help...Cheers Chris