Adminer is a full-featured MySQL management tool written in PHP. This plugin include this tool in WordPress.
The Plugin Debug Objects provides a large number of information: query, cache, cron, constants, hooks, functions and many more.
Wordpress plugin that improves basic search giving you the possibility to do a fine tuning.
Hyper Cache is a performant and easy to configure cache system for WordPress.
The smallest cache plugin ever released (but still greatly efficient).
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The translations reduces speed of Wordpress. This plugin offers a caching solution that reduces this effects on performance.
Supercharges your Blog with production grade Tweaks, Features and Utilities
Admin dashboard widget monitoring MySQL/MariaDB Query cache performance.
Use Firebug with FirePHP to analyze the SQL queries made by Wordpress. Ideal for development and avoid performance issues.