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As you already hinted, SABs have been widely disabled. Chrome is currently the only browser who has SABs and therefore the only browser with support WebAssembly threads.

Workers, on the other hand, are available everywhere. And serialization seems to be far less costly than most people think. In the apps that I have written that make use of a off-main-thread architecture, structured clone has not been my bottle-neck.

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>And serialization seems to be far less costly than most people think. In the apps that I have written that make use of a off-main-thread architecture, structured clone has not been my bottle-neck.

If you're working within a render loop it does hurt, but I agree it isn't an issue for a typical use case. I think what detracts more is the ergonomics of the serialize/deserialize operations. Those are just largely seamless on the emscripten side. On the other hand, a full wasm/emscripten toolchain in your project arguably comes with its own ergonomic cost.

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