Every few years, it’s proposed engines offer a way to precompile scripts so we don’t waste time parsing or compiling code pops up. The idea is if instead, a build-time or server-side tool can just generate bytecode, we’d see a large win on start-up time. My opinion is shipping bytecode can increase your load-time (it’s larger) and you would likely need to sign the code and process it for security. V8’s position is for now we think exploring avoiding reparsing internally will help see a decent enough boost that precompilation may not offer too much more, but are always open to discussing ideas that can lead to faster startup times."

Surprised there was no mention of webassembly, which does exactly this.