Good theory PGF, I am running at 75Hz BUT the start and end times are around a single function that doesn't call flip. The time was fluctuating between 12 and 13 ms, this is in fullscreen mode. In windowed mode (with debug off) it only takes 2-3ms. This must mean that it is some kind of video buffer delay. I also noticed that the main game screen exhibits exactly the same thing i.e. full screen = 12-13ms, windowed mode a mere 0-1ms. My full screen is 800x600 32 colour on a Radeon 9800XT and windowed mode is the same size window on 32-bit desktop of 1024x768, so maybe the Radeon (or blitz) is faster at writing to a window than to full screen graphics, naff.
Whats worrying is that 13ms is close to 75fps so if a little bit of game logic pushes it up to 14ms, frames will be dropped which frankly stinks.
Whats worrying is that 13ms is close to 75fps so if a little bit of game logic pushes it up to 14ms, frames will be dropped which frankly stinks.