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For python, can't you use SIMD by way of C extensions?

On the web? Try substituting the name of a different language for Javascript on the linked press release, and see why it doesn't work.

Huh? If JavaScript the compiler target supports SIMD, your SIMD-supporting language can make use of that.

Dart will do that. Python, Haskell, or whatever are free to do the same.

I think he is talking about real support and not crappy transpilation.

I don't see how that would be related to SIMD support in JavaScript.