Custom code will be compiled to Wasm so it's sandboxed for security purposes. First-party code that ships with Graphite, or perhaps trusted authors in the futur

Custom code will be compiled to Wasm so it's sandboxed for security purposes. First-party code that ships with Graphite, or perhaps trusted authors in the future, will be able to use non-Wasm native code on desktop. But Wasm is still a very high percentage of native speed.