It's Friday afternoon. 4:30pm. Suddenly your new email indicator lights up. A client you haven’t spoken to in months says:
"I've been getting reports that my site is running really slowly. Could you take a look?"
Ever been there? Ever spent a weekend reading through code you wrote, and then code you didn’t write, looking for what could possibly be slowing things down?
The Debug Bar plugin for WordPress can help developers analyze slow sites, as well as solving several other problems.