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Congratulation! We're following this project for long time, considering embedding it in couple of projects. The aim is to use it as a lightweight sandbox to replace docker. But, it still feels like the performance impact is too high compared to docker.

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I see on the blog some performance numbers compared to Spidermonkey.wasm anyone compared it to V8?

The perf blogpost actually uses SpiderMonkey-compiled-to-Wasm as a benchmark rather than a comparison (peer) of Wasmtime. However, there are some good comparisons done by a third party in this paper:

https://arxiv.org/pdf/2011.13127.pdf

See Figs. 20-22 on page 19. They found Wasmtime to be quite competitive to V8 and others.

(disclosure: I work on Wasmtime + Cranelift)

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