It would be nice if when each drawing is opened or force saved a preview image would be created in the temp folder. Then when we Ctrl+Tab to switch between multiple drawings, if we could Ctrl+Tab like we can now to switch between open files and have these preview images cycle instead of having to redraw each file on the screen, would really be helpful. A good example of this idea would be the Alt+Tab previews in Vista (not the Windows+Tab Flip 3D junk) and to a lesser extent the Application. My thinking behind this is mainly when you have huge drawings open in datacad at the same time you almost don't want to use Ctrl+Tab to switch between drawings because of the slow regens of each large file you may have open. This is not an issue on smaller simple files but really can slow down your work flow on large complex projects. With the probability of complex entities and views starting to become the norm over the next few years with smart entities, I think if something like this could be implemented would be a welcome enhancement for sure. Maybe an ini option to have the preview images loaded into memory for faster Ctrl+Tabbing if running from the temp folder is too slow? Also when you start a new Ctrl+Tab, the preview image of the current file you are "leaving" would then be updated. Just bouncing an idea around. 
