Http2 is what I was thinking. Progressive web apps are cutting edge, browsers that support them will also support Http2. It will load a large number of assets o

Http2 is what I was thinking. Progressive web apps are cutting edge, browsers that support them will also support Http2. It will load a large number of assets over a single connection, more efficiently than using concatenation. It dones struggle on bad network connections more than Http 1.1, but the service worker should account for that.