SRD75

Once the Memory Usage Monitor plugin is activated, activating or deactivating any other plugin will display the memory used by that plugin. e.g:
Memory usage for WP Memory: 0.02 MB
For accurate memory usage breakdown for each plugin, you must activate or deactivate them individually; you will not see memory usage when bulk activating plugins.

Memory Usage Monitor

Displays memory/RAM usage for each plugin as they are activated and deactivated.

Scott DeLuzio

AMP-MODE

Debug Info will provide you with information on your current WordPress operating environment. This is a helpful tool for you or a developer to use when trying to identify the root cause of an error, or other issue you may experience.
Debug Info provides the following information:
<ul>
<li>
WordPress version currently running on the site
</li>
<li>
Current/active WordPress theme name, theme version, theme author, and theme URI
</li>
<li>
List of active plugins
</li>
<li>
PHP version
</li>
<li>
MySQL version
</li>
<li>
Apache version
</li>
<li>
Full phpinfo() server environment information
</li>
</ul>
Thanks to <a href="http://firstsiteguide.com" rel="nofollow ugc">Ogi Djuraskovic</a> for the Spanish (es_ES) and Serbian (sr_RS) language translations.

Debug Info

A plugin to display your server's PHP info and WordPress environment data for debugging purposes.

Memory Usage Monitor vs Debug Info