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usually with Rust impactful savings come from writing the Rust differently, not from doing hand-written assembly instead.

See stuff like https://davidlattimore.github.io/posts/2025/09/02/rustforge-...

This doesn't mean Rust is near perfect, it's just that your first move should be "how do I make the Rust better" and not "I need to drop into asm."

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"We’d like to initialise our Vec in parallel, otherwise we’d have to wait for the main thread to fill the entire Vec with a placeholder value only to then have our threads overwrite those placeholder values."

Talk about overengineering :P Multithreaded vector initialisation instead of just...skipping it?

That sentence is specifically talking about not initializing with a placeholder value, and instead letting it write over uninitialized values.

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