webvitaly

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<li><a href="http://web-profile.net/wordpress/plugins/" title="WordPress Pro plugins" rel="nofollow ugc">WordPress Pro plugins</a></li>
<li><a href="http://web-profile.net/wordpress/plugins/info/" title="Info plugin page" rel="nofollow ugc">Info plugin</a></li>
<li><a href="http://web-profile.net/donate/" title="Support the development" rel="nofollow ugc">Donate</a></li>
<li><a href="https://github.com/webvitalii/info" title="Fork" rel="nofollow ugc">GitHub</a></li>
</ul>
Plugin shows in the admin bar: 
* the number of SQL queries during the WordPress execution 
* the amount of time in seconds to generate the page 
* memory load
Admin bar can be enabled in your profile: <code>"Users => Your Profile => Show Admin Bar"</code>. 
This information also added to the bottom of the source code as HTML comment.
<h4>Useful:</h4>
<ul>
<li><a href="https://wordpress.org/plugins/page-list/" title="list of pages with shortcodes" rel="ugc">“Page-list” – show list of pages with shortcodes</a></li>
<li><a href="https://wordpress.org/plugins/iframe/" title="embed content" rel="ugc">“Iframe” – embed content</a></li>
<li><a href="http://web-profile.net/wordpress/plugins/" title="WordPress Pro plugins" rel="nofollow ugc">WordPress Pro plugins</a></li>
</ul>

info

Plugin shows in the admin bar the number of SQL queries, the amount of time in seconds and memory load.

Avram

Ultimate debug bar for your WordPress website. On each page of your website a neat debug bar will be displayed with the following info:
<ul>
<li>PHP version</li>
<li>Request execution time</li>
<li>Request memory consumption</li>
<li>WordPress-related PHP constants defined in your wp-config.php file</li>
<li>All website options (wp_options)</li>
<li>Request data</li>
<li>Timeline (waterfall) where you can see which portion of execution takes too much time</li>
<li>List of all hooks triggered on the page whose execution time exceeds 1ms, along with some stats</li>
<li>List of all database queries performed on the page, along with their source and execution time</li>
<li>Last 100 lines of your debug.log file (if it exists in wp-content)</li>
<li>List of loaded PHP files (categorized)</li>
</ul>
Besides that, it will track request data/hooks/db queries/mem. consumption in AJAX calls too (beta).
This plugin is meant to be used during development and/or debugging only. Only administrators and network administrators (in multi-site environment) can see the debugbar, unless the <code>WP_DEBUG</code> is set to <code>true</code>. In that case, everyone will see the debugbar.
Try it instantly on <a href="https://tastewp.com/new?pre-installed-plugin-slug=ultimate-debugbar&redirect=%2F&ni=true" rel="nofollow ugc">tastewp.com</a>!

Ultimate DebugBar

Ultimate debug bar for your Wordpress website.

info vs Ultimate DebugBar