https://bugzilla.wikimedia.org/show_bug.cgi?id=34023

--- Comment #6 from Daniel Friesen <[email protected]> 
2012-01-30 02:05:44 UTC ---
On a normally loaded page the browser (in parallel) downloads all of the images
on the page. While on a lazy loaded page images are not downloaded until they
are in view.

So on a normal page everything will be loaded and rendered relatively shortly.
When lazy-loaded, the page has finished loading, and the user beings to scroll
down the page reading the content images will begin to come in view as their
reading the content. In a normal page these would already be loaded. In a
lazy-loaded page the browser will start initiating new http requests as the
user is reading. As the user is reading content placeholders will be replaced
with a full image. This change is visible in the corner of the user's eye and
has a similar effect distracting the user from the content they are trying to
read as an animated .gif has.

So yes, they "flash" in.

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