I can confirm the same behaviour on my Sony VGN-FE670G which also uses the intel 945GM chipset.
I upgraded to kubuntu Jaunty from 8.10 kde4.2 and have now poor graphic performance.
Booting from the live Kubuntu 9.04 CD gives same results.
Performance are normal with the live GNOME ubuntu 9.04 CD.
I'm not a linux expert, so that's all I can contribute but let me know if you think you could use the output of some command.
I can confirm the same behaviour on my Sony VGN-FE670G which also uses the intel 945GM chipset.
I upgraded to kubuntu Jaunty from 8.10 kde4.2 and have now poor graphic performance.
Booting from the live Kubuntu 9.04 CD gives same results.
Performance are normal with the live GNOME ubuntu 9.04 CD.
I'm not a linux expert, so that's all I can contribute but let me know if you think you could use the output of some command.