fedora-hubs

#126 delay avatar loading
Opened by garrett. Modified

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As there are hundreds of avatars loading at the same time as the rest of the page, it drags the performance of anything unfortunate to be loaded afterward.

jquery-async-gravatar looks like a good, ready-to-use solution:
https://github.com/llaumgui/jquery-async-gravatar

Blog posts on this topic:

  • https://24ways.org/2010/speed-up-your-site-with-delayed-content/
  • https://josephscott.org/archives/2011/05/delayed-loading-gravatars/

The reason why this is important is due to "head of line blocking" and the limited number of simultaneous connections in browsers.

number of open parallel connections in a browser:

IE 6 and 7:      2
IE 8:            6
IE 9:            6
IE 10:           8
IE 11:           8
Firefox 2:       2
Firefox 3:       6
Firefox 4 to 17: 6
Opera 9.63:      4
Opera 10:        8
Opera 11 and 12: 6
Chrome 1 and 2:  6
Chrome 3:        4
Chrome 4 to 23:  6
Safari 3 and 4:  4

...additional requests are blocked a connection is freed

FWIW: HTTP pipelining also helps too (in addition to delaying the loading of certain resources like avatars), and is included as one of the many improvements in HTTP/2.
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