Performance concerns everything. Not only run time, but everything that has to do with creating a game.
Defold is a turn-key solution, providing everything you need to build a game.
”We think it's a neatly packaged engine that has been a nearly perfect fit for the Hammerwatch project.”
Start here! In this tutorial we start with an empty project and build a complete runner game with an animated character, physics collision, pickups and scoring.
This public Github repo contains a selection of example projects. Download them, try them out, learn from them and then please feel free to use them as you see fit.