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I created a jsperf to measure a hashtable-like object with for-in/Objekt.keys

The performance differs only with 50%, I expected more actually. Am I doing something wrong?

I guess it depends on what you're intent is;

The article states "Code compiled by the optimizing compiler can easily be, say, 100x faster than the code generated by the generic compiler"

So expected a quite more than a factor of 2 ...