HP device monitor 100% cpu and memory hog

You can disable the HP monitor service from running all the time.

The file is located here

/Library/Printers/hp/Utilities/HP Utility.app/Contents/Library/LoginItems/HP Device Monitor.app/Contents/MacOS/

So here is the steps

1. open terminal
2. cd "/Library/Printers/hp/Utilities/HP Utility.app/Contents/Library/LoginItems/HP Device Monitor.app/Contents/MacOS/"
3. sudo chmod a-x HP\ Device\ Monitor

Then reboot