There is a couple issues and they may be related to each other. This just recently started on my site, so something I did or a module I installed may have triggered it, but I don't know what could have. Below describes how it seems to be related to ckeditor.

I have ckeditor in my nodes. When I click on the node/add the page loads just fine, BUT exactly 3 seconds after the page loads something else causes the page to cycle something. Firebug shows that an image is being loaded 3 seconds after that page is completely loaded. The image is from my theme /css/ and is the "-" symbol which is the symbol to indicate that a collapsed field is open. This only happens with nodes that have ckeditor. I have many collapsible fields and when I remove the ckeditor field this issue goes away.

Additionally, if I "reload" this same page (it still does the same thing above) then "ckeditor.js?n26cbg" gets loaded which is over 495 KB.

I'm going to keep investigating this and will post anything new, but does anyone have any idea what's going on here?

UPDATE:

It's the icons.png. (sites/all/modules/ckeditor/ckeditor/skins/moono)

On reload/refresh the page seemingly completes with 28 requests (in my case), then 3 seconds later the page cycles again and icons.png is loaded.

The theme image I mentioned above probably has nothing to do with this issue. It's just being loaded AFTER icons.png.

This is a big issue because my user believe the page is loaded and when they try to click on something nothing happens because the page is not really done loading icons.png.

Please help.