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The users are reporting that their Windows 10 devices have slowed down following the April 2019 cumulative updates. On Tuesday, Microsoft began pushing the April 2019 cumulative updates to Windows 10, 8.1 and 7 PCs. As per the reports, the update causes various issues and the bug appears to be associated with the antivirus software.

Following the installation of Windows 10 KB4493509, users are reporting substantial slowdowns and system freezes.

On a Reddit thread, various comments claim that their Windows 10 installation has slowed down after upgrading the PCs to April 2019 cumulative update.

“This update locks my PC up surprisingly enough. Upon installation my next reboot is completely frozen, I can’t move the mouse, click on anything,” a Reddit user explains. “My computer has slowed down A TON since this update. Startup takes ages. Can’t even access task manager for a few minutes,” another Reddit user documented the problem.

Windows 10 KB4493509 slowdowns some systems

“Installed Version 1809 KB4493509. After reboot it took several minutes at the login screen (not usual on my SSD where it only takes seconds), before I reached the Windows desktop screen. I uninstalled the update and used the “Windows Show and Hide” tool, to hide the update, and now my issue has gone,” another Reddit user stated.

In a post to the Microsoft Answers forum, a user has also documented a similar problem with KB4493509. Similarly, in another forum, users have claimed that April 2019 cumulative update to Windows 10 causes freezes and the system also hangs up.

Antivirus software and Patch Tuesday updates conflict

It also appears that there is a conflict between antivirus software from some vendors and the April 2019 cumulative updates for Windows 10 and as well as Windows 7.

This issue is not just based on the KB4493509 update and it could be associated with other updates released on Tuesday as well. The antivirus vendors are also trying to figure out a possible reason for the conflicts.

Is April 2019 cumulative update also creating problems for you? Let us know in the comments below.

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