https://www.theregister.co.uk/2018/04/30/windows_10_april_2018/ >Unless something goes very badly wrong, the April 2018 Update to Windows 10 lands today, April 30th, 2018*, complete with a new way to handle updates called “Delivery Optimization”. >The idea behind Delivery Optimization is to let you download updates to one PC, once only, then have other PCs on your network grab those updates over your LAN. Microsoft claims “This significantly reduces bandwidth (by as much as 90 percent) and that results in a much better experience for everyone on the network.”