Lazy-load contents of "What's New" interface

[philippotto]

The olvy content seems to always load the content eagerly. In case of big images or gifs, this is a bit unfortunate since the requests can also make actual bucket requests stall.

[valentin-pinkau]

This would be great!

[fm3]

I wrote a duplicate of this today, not realizing that this exists. Some of the info I wrote in #7704 may be relevant to this. I included some measurements also.

[philippotto]

Potential solutions:

• defer olvy initialization and
  • fetch the "unread" count by proxying via back-end
  • OR use another olvy api route to fetch the count
• switch from olvy to somewhere else
• ask olvy to support this
• use a service worker to "stall" the content requests somehow