I admin a website for a student group here at my university, and I usually edit either with Dreamweaver (not in WYSIWYG mode, mind you) or by ssh-ing into the server and editing via nano. Just today, a problem started that I've never encountered before: when I edit a page (any page, and any kind of edit), my computer (running OS X 10.8, latest version) takes between 10 and 20 minutes to display the results of the edit.
I've tried every obvious thing I could think of: I cleared my (client-side) cache, which was no help. I've confirmed that this problem is either specific to OS X or specific to my particular machine — I've tried multiple browsers on this computer, getting the same problem each time, and I've tried using another (Windows) computer, which displayed the results of my edits immediately.
I don't have any idea what could be causing this — some caching problem, maybe? I also don't get why this problem appears to be restricted to this particular site that I admin — that is, it doesn't take 20 minutes for me to receive a new email, or to see a new update on Facebook, for instance.
EDIT: For what it's worth, the Windows computer is connected via ethernet, while the Mac is connected via WiFi. Both are connected to the same network though, and I don't know how that could make a difference.