I recently came across a nifty app called gtop which shows some really cool information and graphs about your system, such as cpu usage, disk, network, etc in real time.
Here's how I installed it:
sudo apt update ; sudo apt install npm ; npm install -g gtop
Then run it with
If you get an error saying "/usr/bin/env: ‘node’: No such file or directory" then try this:
sudo ln -s /usr/bin/nodejs /usr/bin/node
This will symlink it and if you re-run the app it should work!
If you get an error that says "Kernel version not supported" which can happen if running on OpenVZ, you can simply press enter to ignore it, things still work :)
If the graphics don't look right, then try this.
EDIT: Adding a nice one-liner for me to copy/paste because I can be lazy sometimes, lol:
sudo apt update ; sudo apt install npm -y ; npm install -g gtop; ln -s /usr/bin/nodejs /usr/bin/node; gtop
This will install gtop and it's dependencies, fix up the error (if it needs to) and then run gtop.