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Impressive improvements.

I wonder how performance and memory use compare nowadays between V8, Spidermonkey and JavascriptCore.

Does anyone have a link to recent trustworthy and thorough benchmarks? (Google doesn't really spit out anything noteworthy...)

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I believe that JSC is in the lead when it comes to throughput and latency. But that is at least partly based on benchmarks that I had a hand in designing.

I don’t know how the VMs stand against each other on memory. JSC is improving in this area a lot recently but I don’t know if it’s just catching up or leaping ahead or whatever.

It's first-party but I've found the benchmark results frequently posted in their blog do indeed transform into real-world results. https://v8.dev/blog

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