I've been on Windows 10 for a while now, but each build has a few new things I haven't had a chance to look at in detail. One of them is the Update Delivery Optimization feature that allows Windows to pull updates from other local computers or PCs on the Internet. You can find this from Settings -> Updates -> Advanced Options by clicking on the "Choose how updates are delivered". By default it's enabled for Enterprise/Education editions it is set to PCs on my local network and for all others it is set to PCs on the local network and PCs on the Internet. You can read all about how it works in the FAQ. For now I'm changing to PCs on my local network, then at least my other local machines can benefit, just not sure I'm ready to share yet!