[Eridrus]

Depends how you look at it.

If you're using a web page that is mostly just a CRUD app, sure, no-one will wait around for that, but if you're shipping a version of IPython that can run in the browser, I think people would be pretty happy about it as long as the blob can be cached and hopefully shared between sites since it's on a shared CDN.

[azakai]

I think you're right. While downloading a VM doesn't make sense for a small site, for many cases it could. There are also fairly compact VMs for some languages. And WebAssembly will make the VM download substantially smaller.