Windows 10 Insider Preview Fast Build 19628.1 (mn_release) - May 13 Insider

Downloading build 19628.1

Some Windows Insiders might notice that the name of the branch we’re releasing builds from has changed to MN_RELEASE starting with today’s build. As we mentioned back in December, the Fast ring receives builds directly from this active development branch. In this case, we are practicing our ability to change which branch we consider as the active development branch. This is just a short-term change and we intend to release builds from RS_PRERELEASE again soon. As our engineers work in development cycles internally, we may prioritize work being done in a specific branch and may need to move Insiders between branches. The builds from the MN_RELEASE branch are not matched to a specific Windows 10 release.

That doesn't tell much about why and what is the difference between RS_Prerelease & MN_Release.

38 mins to desktop.

Smooth update. 66 min which is about par for me.