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Re:WebAssembly and Back Again: Fine-Grained Sandboxing in Fi... by azakai on Monday December 06, 2021 @10:42AM (#29461075)
There are detailed performance numbers here on a variety of real-world codebases:

https://kripken.github.io/blog/wasm/2020/07/27/wasmboxc.html

tl;dr Something like ~14% when using the best bounds checking strategy, or ~42% when using the most portable one. (There are options in the middle as well.)

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