[alphager]

No, and that's by design, as many browsers limit you to two http-connections per domain. When you're loading tens of images (like map tiles), you want to use as many different subdomains as possible to load them in parallel.

[mfontani]

With HTTP/2 one is way better off using one connection to one domain instead.

How has the world changed.

[1vuio0pswjnm7]

For many years before "HTTP/2", I have been using HTTP/1.1 pipelining, outside the browser, to download hundreds of files over a single TCP connection.