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To be more precise, JITs on top of JITs. :)

We have both an interpreter for ActionScript bytecode as well as a compiler that compiles that bytecode method-at-a-time to JavaScript using a restructuring approach like emscripten's relooper.

Disclaimer: I work on Shumway.

I could give you the old guy's rant, "Back in my day we were happy to have only one 'core' and if it ran at 8Mhz it was in turbo mode!" :-) Its an amazing piece of work.

Bah! Back in my day, we counted ourselves lucky if we had an 8 MHz crystal clock. I had to make do with an uncomfortably temperature-dependent RC oscillator running at what I lightheartedly hoped was about 4 MHz.

(I'm actually pretty young, but I've done work with microcontrollers, which feels like stepping into the past. I know a guy in his late 20s who steadfastly refuses to switch from assembly to C, for reasons that come straight out of the 70s. It's a strange world we live in.)

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