Brad Parbs

Outputs some database query information on page load for logged in admins. Output is located as an html comment in the footer and also in the console.

Database Performance Monitor

Outputs some database query information on page load for logged in admins. Output is located as an html comment in the footer and also in the console.

pantsonhead

Admin’s Debug Tool allows administrators to analyze page execution without executing/displaying for non-admin users. 
This can be useful when trying to track slow queries or badly performing plugins or widgets. 
The admin-only nature of this plugin can also be useful when trying to track issues that only occur on production servers.

Admin's Debug Tool

Admin-only tool for checking execution times and error output of current theme/plugins

Database Performance Monitor vs Admin's Debug Tool