System Monitor for CPU / Memory is a useful Chrome extension developed by Jackie (Guokai) Han. This free tool allows users to easily monitor their system's CPU or memory usage directly from the extension icon. With just a mouse-over, users can view more detailed information about their system's performance.

One of the key features of System Monitor for CPU / Memory is the ability to customize the display options. Users can choose whether to display CPU or memory usage, and they can also select the display format - either as a number or a graph. Additionally, users have the option to set the update frequency and enable or disable the monitoring.

It's important to note that high memory usage doesn't necessarily indicate insufficient memory, as the system cache is also counted as used memory. Furthermore, if users select "Display Type: CPU," they can view the CPU temperature in the tooltip of the extension icon, but this feature is only available on Chrome OS.

Overall, System Monitor for CPU / Memory is a handy extension for Chrome users who want to keep an eye on their system's performance. With its customizable display options and easy-to-use interface, it provides valuable insights into CPU and memory usage.