Hello everybody,
I have this problem: I must run 2 or more opengl applications simultaneously at the same framerate.
I tried to use as experiment the glxgears on nVidia and ATI hardware
but:

- with nVidia I have the same problem decribed in this link:
http://bugs.freedesktop.org/show_bug.cgi?id=19169

- with ATI the framerate (set to 60Hz as a monitor) is 60Hz with 1 glxgears running and slow down to 30Hz with 2 glxgears running

Is there a solution?

PS on nVidia forum there is attachments for modified version of glxgears that show the problem:
http://www.nvnews.net/vbulletin/showthread.php?t=127179