Add THIS to your scripts/startup folder and you will always have a display of triangle count for one or more selected objects in your active viewport.
FAQ
Why does it display “Nothing Selected” when nothing is selected? Obviously because nothing is selected 🙂 I added this because I deployed this script to all artists at my company and I wanted them to get accustomed to looking in that area of the viewport for this information.If you prefer it to go away when nothing is selected, just replace the line else return “Nothing selected” with else return “”