To anyone upset about slowed performance on your Mac after installing the OS X Lion update, please take a moment to read this. Upon successful installation, your computer will attempt to re-index your computer's contents for the purposes of Spotlight functionality and related performance improvements in the long-run. This process, while running, may lead to more sluggish performance (especially on Macs not equipped with SSDs), increased heat, increased fan activity/speed, etc. This IS NOT a Lion 'defect' or issue with the Operating System. It is expected behavior. You should expect indexing activity to complete fairly quickly depending on how your computer is configured and how much on your computer must be indexed. Please allow this process to complete before making a thread screaming about how Apple owes you money back, how Lion is the "Vista of OS X" or any other such nonsense. If you're curious about how to track this, check out the Activity Monitor and have a look through the active processes.