I did a fresh install of Ubuntu then do did some upgrades. After my next restart when I try to open Ubuntu Software Center it took about 20 seconds for the window to load then 10 more seconds before it became click able. While doing some installation of software, Unity lags like hell that every time I click any application it takes a few seconds before I can see it. Even GEdit take a lot of time to load.
The worst part was when I was doing nothing to my computer. Even on that part, my computer lags.
My Laptop is a Brand New Core i3 with 2GB of RAM. Unity should run perfectly on that kind of machine right?
BTW: I reinstalled Ubuntu 11.04 for about 5 times now and still nothing changed.