If you've used GNOME extensions for more than a few months, you've probably realized that they can easily send your desktop into a hellish crash-on-login loop that can only be remedied by dropping to a root shell.
I got tired of GNOME crashing every other day, so I disabled extensions. The thing I really missed, though, was an always-visible system resources monitor. Turns out there's a nice way to get one!
The answer is a minimalistic terminal emulator called Tilda. Here's the bottom-left corner of my screen.
I'll walk you through setting this up.
Install Tilda and htop (or whatever you'd like to run in your widget) and open preferences. Go to the "Title and Command" tab, tick "Run a custom command...," and enter
htop for the "Custom Command."
Configure htop by hitting F2 (if you like what I have going, you can use my htoprc).
Once you get it right, go back to the Tilda preferences, go to "Appearance" and get it to appear at the size and position that you like.
Then from the GNOME launcher, launch "Startup Applications" and add a startup program with command
There you have it!