I don't know whether or not this was mentioned in the past or not, but i'm sure we've all noticed the time it takes from going to different screen sizes. So, instead of making our screen go to the size of the window, which takes lots of time. Why not make the window fit the screen? int xsize=GetSystemMetrics(SM_CXSCREEN); int ysize=GetSystemMetrics(SM_CYSCREEN);

Because :

1) Rendering at a lower resolution is faster
2) Rendering at a higher resolution looks better.

Thus most people don't use the same resolution in games as they do on their desktop.

Does the time you spend switching resolutions really matter? It's only a few seconds... while getting rid of it while still having the same functionality would certainly be a speed improvement, I somehow have the feeling that it wouldn't be major.