This probably explains why recent Windows updates seem to download and install a lot faster than they did a year or two ago.
Microsoft began to roll out its new Unified Update Platform last year, first on mobile and then for Windows 10 Insider Builds as well. One of the advantages of the platform was the use of differential update packages. This meant, all in all, that update packages would be a lot smaller going forward. While updates are released regularly for retail versions of Windows 10, the advantages of differential update packages become visible the most when feature updates are released.