> Are there any WASM runtimes that give (back) C/C++ level performance today, other than V8? People are currently working on them. Also 100% performance is not

> Are there any WASM runtimes that give (back) C/C++ level performance today, other than V8? People are currently working on them. Also 100% performance is not always necessary, getting to 50%ish shouldn't be that hard. That's plenty for a scripting engine replacement scenario, for example. Or for bit banging some GPIOs on a microcontroller. I think Mozilla's WASM engine is somewhat faster than WASM module in V8. The point is regardless you won't need a Javascript engine in the first place. > why not just compile straight to native To be able to run validation checks on the bytecode, so that you can still execute programs that are trusted only to a certain point. And to support multiple platforms. There are also a lot of platforms that aren't supported by LLVM or are not first tier targets.