I can confirm the problem with the same graphics hardware. Extract from lspci output:
00:02.0 VGA compatible controller: Intel Corporation 82Q35 Express Integrated Graphics Controller (rev 02) glxgears -fullscreen gives me 34 frames in 5.0 seconds = 6.773 FPS glxgears (no fullscreen): 118 frames in 5.0 seconds = 23.595 FPS The GUI is generally very sluggish, especially for any operation involving 3D effects, e.g. the HUD, using the 3D windows switcher etc. However, even in the GDM welcome screen, it takes a couple of seconds to render the background image. ** Changed in: xserver-xorg-video-intel (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/931122 Title: 3D performance is very bad To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/931122/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp