My MB Air has been running horribly with Lion.

My MBA is the previous revision - 1.86GHZ/2GB. It ran well with snow leopard, but has been running *terribly* since Lion.
I downloaded Lion when it came out, and I have all the updates installed.
Never before have I needed to restart my mac just to keep it running. The system is slow, and gets unresponsive if I use Safari for more than an hour.
For example, if i have more than a few tabs open, i will get blank pages when i switch between the tabs. I will then get the spinning beach ball, and after several seconds the page will reload. Scrolling through Google Reader stories takes forever.
I could go on and on, but my basic problem is overall system slowness that is temporarily alleviated by restaring.
What can I do?

Has Spotlight finished indexing?  Did you backup your data before installing?  Are you sure all your applications are known to be Lion compatible including plugins and drivers?
The answers for those questions can be found using the tips on: https://discussions.apple.com/docs/DOC-2465

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