System Load / Performance indicator on ubuntu

The system load indicator shows you graphs of your system performance on your panel – like the old GNOME System Monitor applet used to. It shows a graph of your CPU activity by default, but it can show graphs for more than one type of resource at a time – from its preferences, you can enable graphs for network activity, memory, and other system resources.

Install it via terminal:

sudo apt install indicator-multiload
Source: howtogeek.com

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