Just wondering why playing at fullscreen would improve fps. Naively (ie I don't know much about how these things work) I would have thought that was harder on the system.
There isnt an overall answer as it varies alot from game to game / hardware to hardware. Some would argue that its because you also have to render your desktop along with any app that might be running which obviously taxes your system more. But I find that I have more stable fps running fullscreen compared to windowed.