[Qt-interest] QGLWidget 30 fps maximum on Windows XP

[andy fillebrown]

Hi all,

I'm trying to get a QGLWidget to swap buffers at 60 fps (the monitor
refresh rate), but it seems no matter what I try, the fps maxes out at
30 fps. If I drag a corner of the window to resize the main window
containing the QGLWidget, the fps jumps and starts approaching 60 fps,
but as soon as I stop dragging the fps drops back down to a rock-solid
30 fps.

I've read that "window manager" may be responsible for such a low
frame-rate, but I'm not sure what that means or if it's even relevant
(there's so much conflicting info re: opengl out there -- so many
things to try that don't work).

Does anyone know what's going on -- why is the fps seemingly locked to 30 fps?

Frustrated,
~ andy.f