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Looks cool, I'm not much into webassembly... but I see just fews lines of Haskell code produced a gzipped wasm of 448K. How does this compares to other languages?

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Remember that this includes the runtime. It'll hopefully shrink a bit once the wasm gc is stabilised

It's already in Phase 4, so close: https://github.com/WebAssembly/proposals#phase-4---standardi...

The RTS is a bit more than the GC though.

I said a bit, not go away entirely

Does it really need a GC or is JavaScript engine's GC such a bad fit for Haskell?

I think it depends on how much of the GHC RTS semantics you wish to preserve.

The uncompressed wasm binary for a simple fluid simulation in julia is 5k (or 2.7k compressed):

https://alexander-barth.github.io/FluidSimDemo-WebAssembly/

But here the wasm code does only the number crunching. The visualization (and memory allocation) is all done in javascript.

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