HTTP2
It would be nice to have http2 support for Apache and then also for web applications like Drupal, NextCloud and others.
For Drupal, there is a nice module available, that promises to do all the rest: https://www.drupal.org/project/http2_server_push
The problem seems to be that Apache2 up to Ubuntu 16.04 does not come with a supported http2 module due to a serious bug. But maybe Ondrej has resolved that, this needs to be investigated.