On Mon, Apr 21, 2014 at 1:51 PM, Fabrice Florin <fflorin@wikimedia.org> wrote:

If there’s a better way to load the thumbnails than we are now, I’m in favor of experimenting with it, to see if it solves the issue.

The thumbnails are present on the page (with or without MediaViewer), the browser is loading them in the normal process of parsing the HTML. As I said, I don't think there is any reasonable way to influence that.