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You have to know a lot about Rust to write performant Deno.

Is there a list of language code smells? If the best parts of your language come from another language are you better off skipping the middle layer now instead of later when there's more code to rewrite?

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You don't need to know rust to write performant deno

That was not my experience with Node.js and C++. The options were to either accept mediocre performance and all JS/TS or start writing the important bits with the Node-API.

I think optimization in general is about understanding the layer of abstraction below you and arranging your workload to exploit it's efficiencies and avoid it's inefficiencies. (Cases where you can reimplement using a different algorithm and end up doing less work notwithstanding.)

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