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Without the sites being JS heavy shouldn't everything be fast enough already?

This is a JIT for JavaScript...Why would you benchmark non JavaScript things.

Actually this concern is exactly why we built Maglev: A very fast JIT that can generate decent enough code very early so it can help even if you're not running tight benchmarks. In fact, the JIT by itself isn't particularly good at the traditional benchmarks yet. It's just very fast, and the code is most often good enough for real browsing usecases.