There’s lots of good stuff in the attached article, but here’s a nugget for folks running Mavericks on a laptop.

Click the battery icon in the menu bar and notice the item Collecting Power Usage Information… Wait about 5 seconds, and a list of energy hogging apps will appear. Select one of the items and Mavericks will bring up Activity Monitor, showing the average energy impact of your running apps. Cool, right?

Check out the rest of the article.