Usually I notice pretty quickly when my internet connection clogs up with downloads I have not started myself. With the help of tcpdump and lsof it's pretty easy to find the receiving application -- Xcode in this case. So wtf is going on?
Today I learned two things. First, Xcode can automatically download updated documentation. Under Xcode -> Preferences -> Documentation you will find the Documentation Sets tab. This has a "Check for and install updates automatically" checkbox.
Second, Xcode has a little helper under Xcode -> Window -> Activity. This shows you what it's currently doing:
- MacFiets