On 27 July 2017 at 11:00, Mark <[email protected]> wrote: > It has already been mentioned that there is likely no performance > degradation when adding new features. >
That is not always true. For example, ES6 has caused some notable performance regressions for ES5 code initially, due to extensions to the object model that made it even more dynamic. The new @@-hooks were particularly nasty and some cases required substantial amounts of work from implementers just to get back close to the previous baseline performance. Parsing also slowed down measurably. Moreover, many features tend to add combinatorial complexity that can make the surface of "common cases" to optimise for in preexisting features much larger.
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