Have you actually benchmarked polymer in a non-chrome browser?
It is much faster than Angular - somewhere around React performance. Polymer is picked up by big companies already whereas "no one"(big) is using angular 2.x for now.
People here seem to project a weird bubble around Angular/React.
> In other browsers not so. I hope v2 will be much better once they can get rid of the compatibility layer for other ever-green browsers.
Browsers get rid of it on their own - when they implement the standards, shims load when specific functionality is found or not.