Okay....as good an answer as any I guess. I can go get the pics by doing the show picutre right click but its tedious.

Seems to be more on the #of pixels downloaded...since on those really heavy pixel pics people post the red Xs will start like on the third or fourth pic. If the pics don't have as many pixels and load faster the red Xs don't seem to start until the 10th or 12th picture.