More efficient WSUS x64 updates coming for WIN10E.  Reductions from about 4.8GB to 2.6GB are projected for WIN10E features update

https://redmondmag.com/articles/2018/09/27/windows-10-update-sizes-halved.aspx

Microsoft announced a new approach on Thursday to reduce the download size of Windows 10 feature updates, but it only affects organizations upgrading x64 systems using Windows Server Update Services (WSUS).

Previously, Microsoft bundled its x64 and x86 Windows 10 feature updates together via Electronic Software Distribution files for users of WSUS, which is Microsoft’s free update management system for organizations. However, starting on Sept. 27, 2018 at 10:00 a.m. PST, Microsoft will offer its x64 Windows 10 feature updates in separate downloadable packages for WSUS users. This new policy will show up in WSUS for “versions 1703, 1709, and 1803” of Windows 10, the announcement explained.

The new policy will reduce about 2.2GB from the current download size of about 4.8GB for x64 system users, Microsoft’s announcement suggested.