Typically we don’t cover Windows-related content here, however, this is something we couldn’t pass up on posting. Spotted on /r/pcmasterrace, Windows 10 comes with a new addition called “Update Delivery Optimization”, which essentially turns your computer into a server to host Windows updates for other computers to download via the internet. Essentially by the looks of it Microsoft has added some sort of P2P (peer-to-peer) aspect to Windows Update (think Bitcoin or BitTorrent), allowing them to conserve bandwidth.
This is both good and bad as it helps Windows Update to download updates faster, but on the flip-side will cause your internet to be slower (possibly) or reach your bandwidth cap quicker. Additionally this feature is turned on by default, so you’ll want to be aware of that. To turn off the feature and save bandwidth, head over to the official support page to read more.