Babylon.js has always been optimized with mobile in mind. We've done a lot of performance optimizations for iOS/Windows Mobile & Android prior to any integration of webgl 2.0. For instance, when we shipped the Sponza demo available on our site: http://www.babylonjs.com/demos/sponza for 2.3, it was already running @ 60fps on iPhone 6s for instance and 25/30 fps on most mobile. The GPU on high end mobiles are as powerful, if not more powerful, than most laptops. For instance, my iPhone 6s