Introduction

The Windows 11 KB5041585 update, released on August 13, 2024, aimed to enhance system security and address existing vulnerabilities. However, numerous users have reported significant performance issues following its installation, including system slowdowns, crashes, and application failures.

Background of KB5041585 Update

Microsoft's KB5041585 update was designed to resolve critical security vulnerabilities, notably CVE-2024-38063, which pertained to the IPv6 protocol. The update also aimed to fix issues causing BitLocker-related Blue Screen of Death (BSOD) errors. Despite these intentions, the update has led to unintended consequences affecting system performance.

Reported Issues

System Slowdowns and High CPU Usage

Users have reported drastic slowdowns, with systems becoming nearly unusable due to high CPU usage. Tasks that previously ran smoothly now experience significant lag. One user noted that applications like Adobe Photoshop and games such as Diablo and World of Warcraft crash unexpectedly, with error messages indicating excessive memory usage despite low actual memory consumption. (pcworld.com)

Installation Failures

Some users have encountered errors during the installation process, preventing the update from being applied successfully. Common error codes include 0x8007045b and 0x800f0823. Attempts to resolve these issues through standard troubleshooting methods have often been unsuccessful. (berrall.com)

Application Compatibility Issues

The update has also caused compatibility issues with certain applications. Notably, Riot Games' anti-cheat system, Vanguard, used in the game Valorant, fails to load post-update, displaying errors related to driver incompatibility with Windows security features. (berrall.com)

User Solutions and Workarounds

Uninstalling the Update

To mitigate performance issues, some users have chosen to uninstall the KB5041585 update:

  1. Navigate to INLINECODE0 .
  2. Scroll to the bottom and select INLINECODE1 .
  3. Click INLINECODE2 next to the KB5041585 update.
Note: Uninstalling the update may expose the system to security vulnerabilities addressed by the patch.

Disabling Control Flow Guard (CFG)

Another workaround involves disabling Control Flow Guard, a security feature:

  1. Open Windows Security.
  2. Select INLINECODE3 .
  3. Scroll to INLINECODE4 and click on INLINECODE5 .
  4. Toggle Control Flow Guard to INLINECODE6 .
Warning: Disabling CFG reduces system security and should be considered a temporary measure.

Microsoft's Response

As of the latest reports, Microsoft has not officially acknowledged the issues stemming from KB5041585. Their support page for this patch states, "Microsoft is not currently aware of any issues with this update." However, rumors suggest that the company is working on a solution to address the performance problems. (windowsforum.com)

Conclusion

The KB5041585 update for Windows 11, while intended to enhance security, has led to significant performance issues for many users. Until an official fix is released, users may consider the aforementioned workarounds but should remain cautious of potential security risks. Staying informed through official channels and user forums is advisable to keep abreast of developments and solutions.