On Thu, Apr 24, 2014 at 3:27 AM, Gilles Dubuc <gilles@wikimedia.org> wrote:
This global graph suggests that most images load within a second up to the 50th percentile, and only in the 90th percentile do we start seeing 5-second load times, which seems acceptable. Should we be adding API loads or any other data to that number, to get the complete load times?

Instead of doing a straight addition of the existing data, I would prefer to find time this week to add a new metric measuring time from first thumb click to sharp image appearing, as part of this card of mine which has been left on the backburner for a while: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/430 I might not do preloading on proximity, but I'll at least do hover.

Can we also log when the domready event and the onload event of the page happens relative to the click on the thumbnail? As I mentioned in the thread about slow loading [1], we have a problem on slow connections with pages that contain lots of thumbnails, and it would be nice to know how widespread an issue this is. The simplest way I can think of to measure this sort of performance problem is to compare the time passed from click to thumbnail display and the time passed from click to page onload event.

[1] http://lists.wikimedia.org/pipermail/multimedia/2014-April/000285.html