> Compilers can only optimize so much. GWT/Closure do a very good job of it, too. Closure certainly does; I use it every day. If Gmail is an example of how GWT

> Compilers can only optimize so much. GWT/Closure do a very good job of it, too. Closure certainly does; I use it every day. If Gmail is an example of how GWT optimizes things, then I'm afraid you're factually wrong. > Tangential: I'm not sure which version of Polymer they're using - but 1.0+ removes the need for most of the polyfilling. that thread is just 2 months old (i linked to it above)