Description of problem:

As long as you all don't like glxgears for a FPS measurement , I download and install 3D screensevers: :xscreensaver-gl-extras-5.12-14.fc15.i686

All of them gives me 10-12 FPS - when my mouse is still, and ~60 FPS only when I move mouse around or play video (through mplayer for instance).
Shouldn't it be about 60 FPS always?

Screensaver:
FlipText - fps:14, Load:100%, Polys:138
FlipFlop - fps: 10-20, Load:100%, Polys: 456
Engine - fps:10-14, Load:100%, Polys:7,176

Version-Release number of selected component (if applicable):
Kernel: 2.6.38.2-9.fc15.i686.PAE #1 SMP Wed Mar 30 16:47:28 UTC 2011 i686 i686 i386 GNU/Linux
xorg-x11-server-1.10.0-7.fc15
xorg-x11-drv-intel-2.14.0-5.fc15
libdrm-2.4.25-1.fc15
mesa-7.11-0.6.20110412.0.fc15

00:02.0 VGA compatible controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 04)
00:02.1 Display controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 04)


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