Windows 10 “Fast Ring” (RS_PRERELEASE) Insider Preview Builds Changelog

Microsoft regularly releases Windows 10 testing builds known as Insider Preview builds to people who have opted for these builds. These builds are testing builds (such as Beta, RC, etc) and may contain bugs and issues. Microsoft first tests new features in these builds and when the features are ready, these features are implemented in Windows 10 feature updates which are released to public twice a year.


In past, there were multiple development branches or release channels of Windows 10 Insider Preview builds such as Slow Ring, Fast Ring, Release Preview and Skip Ahead. First the upcoming Windows 10 feature update builds were provided for testing under Fast Ring and when they were thoroughly tested, the builds were released to Insiders under Slow Ring and then Release Preview ring. Skip Ahead was an exclusive development channel for Windows 10 which provided latest Alpha builds of Windows 10 which contained latest features under development. These builds were taken from Microsoft's active development branch called "RS_PRERELEASE".
A few months back, Microsoft decided to discontinue "Skip Ahead" branch and Insiders were left with only 3 development channels: Slow Ring, Fast Ring and Release Preview.



Now Microsoft has decided to revamp "Fast Ring" development branch. Microsoft will release latest Windows 10 testing builds from active development branch (RS_PRERELEASE) to Fast Ring similar to Skip Ahead channel. These builds will contain latest features and changes under development. Remember these feature may be or not a part of upcoming Windows 10 feature updates.


So now if you are under Fast Ring branch of Windows 10 Insider Preview program, get ready to test drive early previews of new and latest features which will become part of future Windows 10 feature updates.

Following is the list of all Windows 10 Insider Preview builds released to new reorganized "Fast Ring" branch or channel with their features and changes log:

Windows 10 Build 10.0.19536 Changelog:

Build 19536 was the 1st Insider Preview build of Windows 10 released to new "Fast Ring" after finishing development of 20H1 builds. It was released on December 16, 2019. This new build arrived via new "RS_PRERELEASE" development branch.

• When optional updates are detected, they will be listed under Settings -> Update & Security -> Windows Update -> View optional updates page.
• Re-releasing the updated Korean IME
• New Family Group setup screen in OOBE (Out-Of-Box Experience) wizard
• Windows RE (Recovery Environment) no longer requires an administrator password to access recovery tools
• Updated the new File Explorer search experience to enable you to remove previous searches via an option if you right click the entry in the drop-down
• Bug fixes and general improvements

Windows 10 Build 10.0.19541 Changelog:

Build 19541 was the 2nd Insider Preview build of Windows 10 released to new "Fast Ring" after finishing development of 20H1 builds. It was released on January 08, 2020. This new build arrived via new "RS_PRERELEASE" development branch.

• Updated Location in-use icon in Taskbar notification area
• Now you can show the architecture of each process in Details tab of Task Manager. You can add it by right-clicking on a column header, choosing Select Columns, and selecting Architecture from the list.
• Bug fixes and general improvements

Windows 10 Build 10.0.19546 Changelog:

Build 19546 was the 3rd Insider Preview build of Windows 10 released to new "Fast Ring" after finishing development of 20H1 builds. It was released on January 16, 2020. This new build arrived via new "RS_PRERELEASE" development branch.

• New "Graphing Mode" added to Windows Calculator
• Bug fixes and general improvements

Windows 10 Build 10.0.19551 Changelog:

Build 19551 was the 4th Insider Preview build of Windows 10 released to new "Fast Ring" after finishing development of 20H1 builds. It was released on January 23, 2020. This new build arrived via new "RS_PRERELEASE" development branch.

• Bug fixes and general improvements

Windows 10 Build 10.0.19555 Changelog:

Build 19555 was the 5th Insider Preview build of Windows 10 released to new "Fast Ring" after finishing development of 20H1 builds. It was released on January 30, 2020. This new build arrived via new "RS_PRERELEASE" development branch.

• Bug fixes and general improvements

Windows 10 Build 10.0.19559 Changelog:

Build 19559 was the 6th Insider Preview build of Windows 10 released to new "Fast Ring" after finishing development of 20H1 builds. It was released on February 05, 2020. This new build arrived via new "RS_PRERELEASE" development branch.

• Bug fixes and general improvements

Windows 10 Build 10.0.19564 Changelog:

Build 19564 was the 7th Insider Preview build of Windows 10 released to new "Fast Ring" after finishing development of 20H1 builds. It was released on February 12, 2020. This new build arrived via new "RS_PRERELEASE" development branch.

• Improvements to Graphics Settings page under "Settings -> System -> Display" page
• Bug fixes and general improvements

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We'll keep continue updating this article as soon as a new Insider Preview build is released to new "Fast Ring" branch.




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