I've noticed that the "go to post >>" arrows (or perhaps all related icons) are the last thing to load both on the phone and on a PC. It seems weird that such a lightweight image would always be the last item rendered. On mobile it can be fairly dramatic, taking seconds to finish loading a page that's basically simpletext and that icon while very similar pages don't have this problem.

Why does this happen, and can it be fixed?

PC browser is Firefox 42.0. Mobile is whatever mobile Firefox android shit we're up to now.