Progressive JPEGs

There is some revival of this technique for improving the user experience: http://calendar.perfplanet.com/2012/progressive-jpegs-a-new-best-practice/. The basic idea is that it's better to show the user a blurry image sooner than it is to make them watch the image load top-to-bottom, especially when they are using a screen with a resolution too low to notice (e.g. mobile). Unfortunately, many mobile browsers don't support progressive rendering at all anyways.

Elgg isn't all that image heavy, but I'm curious whether anyone has tried this technique for getting that extra jump on first-page-render experience.

Performance and Scalability

Performance and Scalability

If you've got a need for speed, this group is for you.