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.

PRESSMAN

Hiroshi Sekiguchi

kazunao

PM Yosuke

akihirokato

hirokazusano

kenjinakamura2

toshiroshimizu

takakageyama

Displays performance monitor, such as the Microsoft Windows Task Manager on WordPress. 
The link is made to “Admin menu” > “Tools” > “HM Monitor”.
<h4>Caution:</h4>
This plugin works only in Linux environment.

HW Monitor

Displays performance monitor, such as the Microsoft Windows Task Manager on WordPress.

Memory Usage Monitor vs HW Monitor