I just wrote two quick widgets: CPU Overlay and Developer Settings Shortcut. CPU Overlay is a quick method of launching the "Show CPU Usage" option from Developer Settings. Simply click it and your CPU usage will be displayed on screen. Developer Settings Shortcut is just a settings shortcut to the Developer Options. Strangely, there was no built in shortcut widget for them already, so I wrote one.
Enjoy.
https://play.google.com/store/apps/developer?id=FungalJungal