Mike Jolley (a11n)

Testing your WordPress site? This plugin allows you to display memory, page load time and query count in the footer of your site on both the front-end and within admin.
This plugin is partly based upon the WP Query Counter by Steven Word (http://www.stevenword.com/plugins/wp-query-counter/) and has been customised for my testing needs.
If you’d like to contribute to the plugin you can find it on GitHub: <a href="https://github.com/mikejolley/WP-Page-Load-Stats" rel="nofollow ugc">https://github.com/mikejolley/WP-Page-Load-Stats</a>

WP Page Load Stats

Not sure why this only has 100+ users but this is a great tool!

Excellent!

Display memory, page load time, average load time and query count in the footer of your site.

Bastien Ho

NOUS Open Usefull &amp; Simple

Not tested on non linux hosted sites !
WordPress monitoring, displays for the super admin, the server ressources on the (network) dashboard
<ul>
<li>hostname and distro</li>
<li>size of the wp-content directory</li>
<li>available memory</li>
<li>space used on linux partitions</li>
<li>process running on the servers</li>
</ul>

Ressources

Monitoring the server resources with dashboard widgets

WP Page Load Stats vs Ressources