This plugin lists the top 100 slowest actions and filters during a page request in WordPress. It helps you figure out performance bottlenecks in themes and plugins.
Requires Debug Bar.
Current limitations:
- Does not time nested actions and filters due to a core bug
- Does not time actions and filters before plugins_loaded or muplugins_loaded if placed in mu-plugins
- Does not time actions and callbacks after wp_footer at priority 1000