Comment #27 on issue 90 by [email protected]: V8 doesn't stable sort http://code.google.com/p/v8/issues/detail?id=90
The built in implementation is not going to be hugely faster than one you write yourself. The built in one is written in JavaScript, after all. Of course there is a cost to being stable. See http://jsperf.com/stable-sort/2
If you want a stable sort in the platform, you should lobby the EcmaScript standardization committee to add it to the standard library. Then, whenever IE11 is obsolete you will have it available on the web platform. V8 does not normally add stuff that is not part of the ECMAScript standard.
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