WPDB Profiling
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This plugin will give you the total number of queries to the db per page, as well as the total time it took to render those queries out to the page.
Render database profiling at the bottom of all WordPress pages. To install, upload wpdb-profiling to the /wp-content/plugins/ directory, activate the plugin, and enable / disable features from the wp-admin plugin screen.
This plugin is available for download for your site.