Map and Set iterators are now way faster in V8, up to 11x (as per @bterlson's request) 

http://benediktmeurer.de/2017/07/14/faster-collection-iterators/ …pic.twitter.com/KOcO57PB5I
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That highly depends on the exact workload. Not so easy to put a general number by it. What I see is mostly dictionaries are still faster.
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