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They also probably know about the tradeoffs. V8 has to choose when interpret and when to compile, when to load things into memory, when to garbage-collect, etc. and they do so keeping in mind it is running javascript from the internet, for any kind of application, on any kind of device.

Hermes can make many more assumptions and so the engineers, even if they built something very similar to V8, can probably dial the knobs much more differently to optimize for what Hermes cares about.

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