https://www.bleepingcomputer.com/news/microsoft/microsoft-plans-to-make-monthly-windows-10-updates-smaller-in-size/

Earlier this year, Microsoft announced that it will retire Windows 10 delta updates next year in order to focus more on express updates and deliver smaller updates packages.

In a blog post published last week, Microsoft announced that they're developing an improved Windows Update mechanism that would create a small update package for easier and faster deployment. The new design for quality updates for Windows 10 and Windows Server is coming later this year with Windows 10 version 1809 (codenamed Redstone 5).