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Windows 10 Insider Build 18917 Tests New Download Throttling Settings

Microsoft has released Windows 10 Insider Preview Build 18917 to Insiders in the Fast ring. This build includes numerous improvements such as new Windows Update download throttling settings, WSL2, Narrator improvements, and Windows Ink improvements.

Microsoft has released Windows 10 Insider Preview Build 18917 to Insiders in the Fast ring. This build includes numerous improvements such as new Windows Update download throttling settings, WSL2, Narrator improvements, and Windows Ink improvements.


If you are a Windows Insider in the Fast ring, you can update to the Insider Preview Build 18917 by going into Settings -> Update & Security -> Windows Update and then checking for new updates.

New download throttling in Windows Updates

Earlier this month, we reported that some hidden features were discovered in the latest Windows 10 Insider builds. One of these features is new Windows Update download throttling settings that let you specify the exact amount of bandwidth you would like to allocate to Windows Update.


This feature has now come to build 18917 so that Insiders can start testing it. To access these new settings you can search for "Advanced Delivery Optimization settings" and then select the search result that appears.


Once at the page, you will be able to specify a specific amount of bandwidth to allocate to downloads as shown below.

What’s new in 18917

Narrator improvements:


Data Table Reading Improvements: We’ve optimized the information you hear with Narrator when navigating a table using table navigation commands. Narrator now reads the header data first, followed by the cell data, followed by the row/column position for that cell. Additionally, Narrator only reads the headers when the headers have changed, so you can focus on the content of the cell.


Windows Subsystem for Linux 2:

WSL 2 is a new version of the architecture that powers the Windows Subsystem for Linux to run ELF64 Linux binaries on Windows. This new architecture, which uses a real Linux kernel, changes how these Linux binaries interact with Windows and your computer’s hardware, but still provides the same user experience as in WSL 1 (the current widely available version). WSL 2 delivers a much faster file system performance and full system call compatibility, which lets you run more applications like Docker!

Windows Ink Workspace Updates:


As we mentioned last week, you may notice that Windows Ink Workspace has changed on your PC. That’s because we’re updating the Windows Ink Workspace experience and starting to roll it out to some Insiders.

As part of this, Windows Ink Workspace now takes up less screen real estate, and we’re converging our whiteboarding experiences with a new direct link to our Microsoft Whiteboard app. Microsoft Whiteboard is a freeform digital canvas where ideas, content, and people can come together. It includes an infinite canvas, optional backgrounds (including graph paper and solid dark grey) to choose from, rainbow ink support, multiple pages, and generally addresses much of the feedback you shared with us about Sketchpad. If you used Sketchpad, don’t worry – we saved the sketch you were working on in your Pictures folder.


We heard your feedback, and we’ve streamlined the Windows Ink Workspace for you. Stay tuned as we continue to evolve! Once the new experience arrives on your PC, please take a moment to try it out and share feedback via Feedback Hub under Desktop Environment > Windows Ink Workspace. If the Windows Ink Workspace icon isn’t visible in your taskbar, you can show it by right-clicking the taskbar and selecting “Show Windows Workspace Icon.”

General changes, improvements, and fixes for PC:

  • We fixed an issue where some users experienced a 0x8007000E error code while downloading the build due to high RAM consumption.

  • We fixed an issue where users couldn’t use the desktop Features on Demand “add a feature” option.

  • We fixed an issue where dragging the emoji and dictation panels was unexpectedly laggy.

  • We’re in the process of rolling out a change in this build to address an issue where if the taskbar was set to autohide, launching the Start menu would first hide the taskbar before bringing up the Start menu.

  • We fixed an issue resulting in the Start menu and taskbar going 100% transparent on secondary monitors or after projection.

  • We’ve updated the new File Explorer search experience to now be dark when used in dark theme. Note – this experience is still in the process of rolling out. Thanks everyone who’s tried it so far and shared feedback, we’ll let you know when the rollout expands.

  • We fixed an issue where Windows Security would crash if launched from Settings when using an Arabic display language.

  • We fixed an issue where the audio service might hang on shutdown if spatial audio was turned on.

Known Issues:

  • This update might fail the first time you try to download it with a 0xc0000409 error code.

  • For Home editions, some devices might not see the “update installed” on the update history page.

  • For Home editions, some devices might not be able to see the “download progress %” change on the Windows Update page.

  • There has been an issue with older versions of anti-cheat software used with games where after updating to the latest 19H1 Insider Preview builds may cause PCs to experience crashes. We are working with partners on getting their software updated with a fix, and most games have released patches to prevent PCs from experiencing this issue. To minimize the chance of running into this issue, please make sure you are running the latest version of your games before attempting to update the operating system. We are also working with anti-cheat and game developers to resolve similar issues that may arise with the 20H1 Insider Preview builds and will work to minimize the likelihood of these issues in the future.

  • Some Realtek SD card readers are not functioning properly. We are investigating the issue.

  • Tamper Protection may be turned off in Windows Security after updating to this build. You can turn it back on.

  • We are aware of an issue with the Bopomofo IME where the character width is suddenly changed to Full width from Half width and are investigating.

  • We’re investigating an issue where some users are reporting that File Explorer search is rendering in an unexpectedly small area and clicking it results in a crash.

Known issues for Developers:

  • If you install builds from the Fast ring and switch to either the Slow ring or the Release Preview ring, optional content such as enabling developer mode will fail. You will have to remain in the Fast ring to add/install/enable optional content. This is because optional content will only install on builds approved for specific rings.

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