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The web page doesn't say anything about asm.js - so this is a generic JS JIT that happens to beat V8 in asm.js?

V8 doesn't explicitly support asm.js so it's easier to beat than Firefox.

Yes, it is generic.

It is generic, but the graphs on arewefastyet.com suggest that it isn't actually making most regular benchmarks go faster, just some of the asm.js-style ones.

It makes one or two of the Octane benchmarks faster, like Mandreel. But Mandreel is quasi-asm.js as well.

A powerful JIT like LLVM will tend to do best on large long-running benchmarks, like asm.js.

Well, that would make sense as asm.js is just a formalization of what the optimizing compilers were doing with LLVM transpiled JS code: http://mozakai.blogspot.com/2013/06/what-asmjs-is-and-what-a...

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