I understand some, but not all of this. If I follow, this is not unlike, say, Flutter or Kotlin, but with greater performance because Rust and WASM?

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I don’t know enough about Flutter or Kotlin to compare them. But Rust compiled to WASM feels like native speeds.

The tldr; is Will wants to write a fast Nostr client that runs in a browser.

nostr:npub1xtscya34g58tk0z605fvr788k263gsu6cy9x0mhnm87echrgufzsevkk5s wants to write an app in Rust (which often surpasses C++ in speed but without as many ways to shoot yourself in the foot) to WASM instead of native machine code for a certain CPU. WASM can be executed by web browsers at speeds that are starting to approach native speeds and are certainly much faster than JavaScript.