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glxgears SLOWER with nvidia vector card when full-screen

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Hi everyone !

something weird happens on my PC:

when I enlarge th glxgears window (full screen) my nvidia card results in a slower frame rate than the humble internal
intel graphics controller:

This is what I got:

Code:

mimis@goldberg:~/learning/aster/contact/cnt1$ inxi -G
Graphics:  Card-1: Intel 3rd Gen Core processor Graphics Controller
          Card-2: NVIDIA Device 1212
          X.Org: 1.13.2 drivers: intel (unloaded: fbdev,vesa) Resolution: 1920x1080@60.0hz
          GLX Renderer: Mesa DRI Intel Ivybridge Mobile GLX Version: 3.0 Mesa 9.0.2

Code:

mimis@goldberg:~/learning/aster/contact/cnt1$ optirun inxi -G
Graphics:  Card-1: Intel 3rd Gen Core processor Graphics Controller                                                                                                 
          Card-2: NVIDIA Device 1212                                                                                                                               
          X.Org: 1.13.2 drivers: intel (unloaded: fbdev,vesa) Resolution: 1920x1080@60.0hz                                                                         
          GLX Renderer: GeForce GTX 675M/PCIe/SSE2 GLX Version: 4.4.0 NVIDIA 334.21

and this what I get when I run glxgears fullscreen (optirun glxgears produces a visibly shacking result):
Code:

mimis@goldberg:~/learning/aster/contact/cnt1$ glxgears
Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
303 frames in 5.0 seconds = 60.490 FPS
300 frames in 5.0 seconds = 59.982 FPS
300 frames in 5.0 seconds = 59.994 FPS
300 frames in 5.0 seconds = 59.985 FPS
300 frames in 5.0 seconds = 59.989 FPS

Code:

mimis@goldberg:~/learning/aster/contact/cnt1$ optirun glxgears
2199 frames in 5.0 seconds = 436.606 FPS
172 frames in 5.0 seconds = 34.220 FPS
181 frames in 5.0 seconds = 36.168 FPS

why is this happening? where should I start looking?

best regards to everyone

m

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