I remember going from Leopard to Snow Leopard was a huge performance boost.
Going to Lion, is it going to be the case? Read so many reviews yet none of them discussed this (many discussed gestures and mission control, etc).
I'm running Core 2 Duo 2.0 Ghz with 4GB RAM and Nvidia GeForce 9400. Late 2008 Macbook unibody.
EDIT (for future me doing google search): It works very well. Performance is quite the same as Snow Leopard. Should wait a bit for spotlight indexing, and don't plug in time machine drive while spotlight index!