Ever since I installed Lion yesterday I've had my CPU cores basically pegged. Initially, I attributed it to the Spotlight re-indexing that happens right after install. Now that is done and my 4 CPU cores are still pegged and my fan is constantly going. This is on a 15-inch MBP mid-2010 model. Looking at the Activity Monitor it seems to affect any app that I've recently used but Finder is always at the top of the list using >100%. If I quit any of those apps and restart them, they start off around 20% and then slowly begin using more and more CPU until they settle out around 100%. Simple things like clicking a menu can have a delay of a second or two, whereas in Snow Leopard it was instantaneous. Anyone else experiencing this? Have you found a solution?