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This blog post, and your reply, both touch on how difficult it is to measure performance. But then in the same where you point out that there are many different valid ways you could measure performance, you also make the broad claim that "JSC tends to outperform V8". What are you basing that on?

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These days we use JetStream 2 (our design) and Speedometer 2 (collaborative design between WK and Chromium folks) as the main big benchmarks but it’s not the only thing we measure and tune.

V8 used to have their own JS benchmark, Octane, but they retired it at about the same time as we beat them on it. So JSC is fast enough to make other people retire their benchmarks.

And by the way if you are interested in what we think of as good methodology you should read about JetStream 2: https://webkit.org/blog/8685/introducing-the-jetstream-2-ben...

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