Amit Gupta

This plugin is to lookup which hooks are slow in execution in plugins and current theme.
This plugin needs <a href="https://wordpress.org/plugins/debug-bar/" rel="ugc">Debug Bar</a> plugin to be installed and activated. It adds a panel labelled “PMC Benchmark” in it.
This plugin is for use in development environment only and not meant for use in a production environment.
Github: https://github.com/Penske-Media-Corp/pmc-benchmark

PMC Benchmark

A benchmarking plugin to profile slow hooks.

tierrainnovation

Render database profiling at the bottom of all WordPress pages. To install, upload <code>wpdb-profiling</code> to the <code>/wp-content/plugins/</code> directory, activate the plugin, and enable / disable features from the wp-admin plugin screen.

WPDB Profiling

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.

PMC Benchmark vs WPDB Profiling