Fantastic article Grgur Grisogono! I love the deep analysis of how the transpiled code actually looks — that should really help people understand what ES6 is doing under the hood.

Question though… do any of your suggestions actually result in _performance_ improvements? Yes, the transpiled/minified code size makes a difference, but you didn’t really address runtime performance at all (in spite of it being part of your title).

It would be incredibly helpful to know if any ES6 constructs transpile into _inefficient_ code, because although the difference in byte size certainly matters it’s a far more useful article if transpiled code becomes slower (I don’t necessarily see how it could get faster).