I've noticed a few things with the KB5012643 update too. This update is primarily a cumulative update for Windows 10's 20H2 version and more recent versions. It's meant to bring security improvements and patches for certain vulnerabilities, so it's mostly behind-the-scenes stuff. You might not see obvious new features but it's crucial for keeping your system secure.
As for performance changes, sometimes updates can inadvertently tweak settings or cause conflicts with existing software. If you're experiencing issues, a common first step is to check if any settings got reset or if there's any new software conflict. Sometimes, just rebooting the system can help settle things down.
If you want to revert to a previous state, Windows has a built-in option to uninstall recent updates. Go to Settings > Update & Security > Windows Update, and look for "View update history." From there, you can choose "Uninstall updates" and select the one you’re having trouble with.
For dealing with post-update issues, it’s good to ensure all your drivers and third-party software are up to date. Sometimes compatibility fixes are required after a Windows update. You can also run the Windows troubleshooter which might help identify and fix the issue.
It's always a good idea to check the official Windows release notes for any updates. They offer detailed information on what’s included and known issues, which can provide insight into what might be causing problems on your system.
