I upgraded to Lion yesterday, on a late 2007 macbook with 4 GB of RAM. Overall the machine seems to be running at much higher CPU usage than with SL and with more noise from the fans than before. One thing I have noticed is that whenever I mouse over the top right section of my taskbar (i.e. wihere the wifi, and volume is) I constantly get a spinning beach ball. This is really annoying as I can't access my wifi or sound options. This only occurs when I mouse over icons associated with the OS (e.g. wifi or volume or symbol viewer) but not with 3rd party apps like evernote, dropbox or papers. Anyone else experiencing this? Any tips?