Update KB4559309 making computer slow – Windows 10

Windows users reported an issue with Windows Update KB4559309 that comes up with the automatic updates. This update is related to the Microsoft Edge browser. It’s a Chromium based version of the Edge browser. Ever since after installing this update, users encountering the issue with slow start up, programs not responding, unable to launch the documents, pictures etc. The computer startup becomes extremely slow.

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It is also observed that, there is no possibility of uninstalling the update KB4559309 from your computer once it is installed. For every faulty Windows Update, the easiest way of fixing the problems is to uninstall the updates themselves. But in this case, you cannot uninstall the update KB4559309 and your attempts will fail with a vague error message stating that the “update is required and cannot be uninstalled”.

What is Windows Update KB4559309?

Windows Update KB4559309 and KB4541302 Update for Microsoft Edge will be available for Windows 10 Version 2004 for x64-based Systems. If your computer has the latest Windows Updates installed, you will automatically get this Edge browser update and force you to install it on your computer.

How to fix slow performance issue with update KB4559309?

Microsoft is aware of this issue with the Edge browser latest updates. They are investigating on it as well. You can also see the discussion related to this issue on Microsoft Forum. However, there are few options that can help you to get back your computer to work properly.

Follow the below troubleshooting steps and fix the issue with computer slower performance with Update KB4559309 on your computer.

As there is no option to uninstall the update installed, you can try performing the System Restore or blocking the update from the System Registry. Also, we are listing some common troubleshooting steps that helps you to boost back your computer.

Perform System Restore:

System Restore feature helps you to restore the computer to the previous working state. With this, all the settings will get restored. There will not be any data loss or data recovery with this step. Before the Windows Updates are installing on your computer, an automatic restore point will be created.

You can check for the possible restore points and restore your computer to the point where the update was not installed.

Refer the below link to create or perform a System Restore on Windows 10 computers.

How to perform System Restore on Windows 10 computer?

After the System Restore, check if the computer performance is fine. If the issue still persists, you can proceed with the further steps.

Also Refer: How to create a System Restore point in Windows 10?

Modify System Registry to block Update KB4559309:

If the System Restore does not help, you can try to edit the System Registry to block the Edge browser update KB4559309 manually. To perform the same, refer the below steps.

  1. Press Windows logo + R keys on your keyboard to open RUN window. Type regedit and hit enter to open the System Registry.

2. On System Registry, navigate to the path HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft. Right click on the Microsoft folder, select New and then select Key.

3. Name the key as EdgeUpdate and click on OK to save changes. Next, right click on EdgeUpdate, select New and then DWORD (32-bit) Value.

4. Name it as DoNotUpdateToEdgeWithChromium and click on OK.

5. Double click on it and change its Value data from 0 to 1.

Close the registry editor, reboot your computer for the changes to take effect. This will block the Microsoft Edge browser update and do not allow to install the Update KB4559309 on your computer.

Is the computer still slow?

If you feel the computer is still performing slow, you can perform the required troubleshooting steps to boost up the system performance and check if that helps.

Refer the below articles, to know what factors causing the slow performance and how to boost up the speed.

Speed up your slow computer in 9 simple steps.

what makes your computer slow?

How to Speed up Your Slow Computer?


The above troubleshooting steps helps you to fix the issue with Microsoft Edge update KB4559309. As discussed earlier, Microsoft also working on this issue and will release the patch for this bug in the further updates. If you need any further help, do comment below. You can also ask more on our Forum.

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Sameer is a BE graduate in ECE and has an immense interest in following Windows, Office and other technology developments. He's also a person who enjoys writing about technology related to the geek world.