the corruption happens only if the hard disk is damaged or the ram is damaged
your ocd only can be settled by a real backup saving copies of your personal files each couple of weeks, days, whatever your ocd behavior allows
the heavy 3d load happens on cpu and gpu, ram also, not on your hard disk, remember that information is stored on hard disk and written when you ask to be written something like a saved file or game, the rest is pure rad, under the load of the simulator the cpu and gpu were a bit exhausted so the laggy response on the desktop
don't run a simulator in windowed mode, only in full screen, desktop works weird on those situations as you see