More detailed data: All other conditions "equal", NVidia GeForce 8400 GS video. "Windowed" = default size window.
Version 10d, Sleep=1
Full Screen______FPS 165-180_______CPU 35%
Windowed_______FPS 240___________CPU 44%
Version 11L, Limit Frame Rate UNchecked
Full Screen _____FPS 111____________CPU 18%
Windowed______FPS 111____________CPU 18%
[i.e., no differences]
Version 11L, Limit Frame Rate Checked.
Limit=60, Actual 60, CPU=13%
Limit=105, Actual 102, CPU=18%
Please note that I never complained about the previous ("sleep") controls, and that the only significant technical question I asked was:
Why is it important for the frame rate to be constant? Wouldn't +/- 15% or 20% be unnoticeable?
I understand that there's been a tremendous amount of effort put into "limit frame rate" and
keep the frame rate constant, of course. But it appears that, even with "limit" UNchecked, there's a big performance hit.