i have read this article (in german)
http://techmixx.de/windows-10-updates-versand-an-andere-pcs-deaktivieren/
google translating:
Windows 10 has many new features that build that user data is stored in the Microsoft cloud. Another new feature is the torrent-like sending and receiving Windows updates. Normally, the update function so that a Microsoft server communicates with the PC and sent an update if necessary. Since most desktop computers have Windows as the operating system world, Microsoft has to pump into the server infrastructure gigantic sums. Sometimes the servers are overloaded and the updates come somewhat delayed on. Now Microsoft has incorporated an option that every PC itself can serve as a kind of small servers for updates. This means that my computer sent to other computers updates, but can also receive the updates directly from other computers worldwide. Without any Microsoft server. One may wonder whether that's for sure, but it is as safe as it used to, in principle, for each file that is sent or received, checked for authenticity by a digital signature. You have to remember that you have to wear dispatch the Internet traffic cost only. Because today everything runs through flat-rate, no additional costs are incurred, except for the extra bit of power consumption. The costly connections via LTE / UMTS sticks are automatically detected and no data is sent. I think it's a good idea to distribute the update load something. It can also have a positive impact on global timeliness of Windows 10 systems. Who still remember it can disable a few clicks and reactivate it.
windows-start
--> settings
--> updates and security
--> windows update
--> advanced options
--> select transmission of updates
here you can disable sending updates to other computers and to receive updates from computers that dont belong to microsoft.