Question: I'm running ubuntu lucid lynx on the following config:

* 2GB DDR2 Ram
* 1.50Ghz Core2Duo
* Nvidia 128MB 8400GS GFX Card

Due to some reason the entire operating system feels laggy. The window manager, firefox and rhythmbox and almost all apps feel a bit slow. There is almost a second time lag between the time I press ctrl+T to open a new tab on firefox and the time it actually opens. This site itself renders in frames and the scrolling up and down is a pain.
Rhythmbox takes 1 sec to maximize and minimize and I cant even dream of a changing the workspace.

My question is if Windows 7 is running perfectly on my comp why isnt Ubuntu? I really hope there is a way because I would love to ditch windows and move over to linux full time.

Is there anyone for whom ubuntu works as it should while running a similar config?
Thanks

Answer: 
I suspect it is the graphics card slowing you down (it is a low end model) - what driver are you using for the card?

You should install the Nvidia restricted driver for the best possible performance.

Also you mention no issues on Win7 - does it work on the aero interface OK?
Maybe there is a problem with your ACPI.
y'know, i installed Ubuntu on My computer and my friend's. we have **exactly the same hardware** on **different Motherboards**. It didn't installed normally on my pc, i used the '*ACPI Workarounds*' option to make it go, but on her PC everything was okay. Ubuntu runs perfectly smooth and fast on her PC, but it's very very slow on mine.

to check this, -if you're using Windows- go to '*Device Manager*' and see if there is an item probably named '*Unknown Device*'