i have a hp pavilion dv2500 notebook with nvidia Geforce 8400M Gs as graphic card.
i installed ubuntu 12.04 on it. everything is ok but nvidia driver.
when i installed nvidia graphic driver, performance reduced: unity became slow, firefox scrolling became slow and same thing happened for pdf reader. also boot time is longer.
i never had such a expectation, in fact my expectation was completely vise vera. i expected nvidia driver performance be better than nouveau.
now i'm using nouveau. in unity 2d it is ok but i cannot use unity 3d using nouveau in ubuntu 12.04.
who know what is the problem with my nvidia graphic driver? how can i solve that?
i installed that using "Additional Drivers".
i had same problem with nvidia driver in openSUSE also.