The cost of transpiling es2015 isn&#x27;t very visible here, because the &quot;vanilla es6 TodoMVC&quot; example used [1] doesn&#x27;t rely heavily on ES6 only features, such as generator functions etc., that aren&#x27;t just sugar on top  of ES5.
Such features are expected to decrease the performance of the generated code significantly and should be taken into account when a transpilation step is involved.<p>[1] <a href="https:&#x2F;&#x2F;github.com&#x2F;tastejs&#x2F;todomvc&#x2F;tree&#x2F;master&#x2F;examples&#x2F;vanilla-es6" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;tastejs&#x2F;todomvc&#x2F;tree&#x2F;master&#x2F;examples&#x2F;vani...</a>