My sim is rocking!-So Why?

Just a wee note to all XP and Fs9 users. I suppose thats a lot!!(lol)I have noticed a number of times that my 2.4, 1GB Gmax 420 setup suddenly starts to run the sim so smooth its amazing.I have pre-set 20fps, and some of the time I can get small shudders in passing through heavy cloud, but the frame rate is still easily flyable. However earlier on tonight I had an inexplainable 'boost' when everything just went superbly, irrespective of what scenery, weather, clouds or aircraft I was using. It just suddenly 'rocks'!I do know that XP is a learning system, and have found re-boots can often sort out problems across a range of software, each re-boot giving better performance. Somewhere along the line I have come to believe that when adding in new stuff, or changing Fs9 in any way, I do not despair of falling FPS, or crashing system (very rare in my case), as I know that a few restarts and things work themselves out.Just my experience, Possibly having patience is indeed a virtue in this sim, and we need to let it settle over a few re-boots if all is collapsing around us. Let the OS take the strain!Anyone else found this?