Of course the impact of the performance hit would depend greatly on your hardware and the demands of the game itself. If you click 'Next' a couple of times, you will notice that the Z on your keyboard also produces an Z in DOSBox. The wiki link TheJoe posted even says as much. Unfortunately many games are badly ported - so they often do not support it in full-screen mode.
#Dosbox alttab out return fullscreen Pc#
The performance should take a hit if you run like that, since instead of rendering just the game, your PC will be rendering the desktop as well as the game simultaneously. To switch it on, just click the green button. However, I don't see how this could improve game performance. If it shows two arrows pointing outwards, you can open it in a full-screen mode. Stable alt-tabbing I can see as being beneficial, though I personally find the times that is needed are few and far between and those rare occasions where I might need it, the Steam overlay works fine (don't hate, I manage all my games through Steam these days, though that isn't an option with DOSBox games).
If you use more than 1 screen you also automatically tab out of fullscreen stuff if you klick on something on the second screen. Dosbox jumps to windowed mode and changes some aspect ratio settings while doing it if you tab out. Also quite some may crash or get graphical errors when you do it.
Darkcloud: Most games take quite a while when tabbing out of fullscreen to get back in.
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