Want to know OSX

hi guys.
i have macbook air 2008 late. but my mac have problem about very very delay on screen movment.
So do i have to install any Geforce graffic card programm ?  Leopard in the macbook air's box but that macbook air still running Lion OSX, is it fine?
and what difference about Lion between Leopard? Lion have more features than liopard? Pls share your knowledge..
Thanks...

Guys...
My Macbook air not delayed durring start up. i thought cooler works not well there for my display movment very very delayed durring CPU's teprature goes high. So All Macbook air 2008 late have this problem? or no?
If no, i will change my OS Lion to Leopard. Maybe Lion more processing then Leopard, Maybe My mac can just run Leopard normally.!!!! Please i need advise.....
Thanks.

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