I think it’s more of a function of how many pictures are uploaded to the current page.  At the moment, I count 8.  Even though some are thumbnails, I think the whole image is downloaded each time you do a request of the page - which is my guess why it seems slow at times.  I didn’t notice any performance problem just now, but my connection is pretty fast.  When it seems slow, let us know and we’ll see if we can confirm it.