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V8 Release 5.1

v8project.blogspot.com

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Re: V8 Release 5.1

#62
post #53
post #41

Did they run speed benchmarks against older versions of V8? I'm wondering about the performance cost of these new features (hopefully zero).

Unfortunately it is much larger than zero see https://groups.google.com/d/msg/strengthen-js/ojj3TDxbHpQ/T6... . It is very sad that people working on es spec do not care enough about performance

Yup. To some, performance is just an implementation detail, and they keep adding hooks like @@hasInstance.
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