I wonder if this could be solved with a better caching system for dependencies shared between multiple sites. Maybe some kind of content-addressable cache? If

I wonder if this could be solved with a better caching system for dependencies shared between multiple sites. Maybe some kind of content-addressable cache? If your users only have to download the language runtime once, the idea of using a runtime for a popular language on your site doesn't seem like such a bad idea. Popular runtimes could even be pre-cached and shipped with the browser.