KB5001391 update fixes Windows 10 high CPU usage, Start menu issues

Ahead of
Windows 10’s May 2021 Update launch, Microsoft is ironing
out the remaining bugs in the supported versions of the
operating system.

After applying recent cumulative updates, some users started
seeing high CPU usage, which is caused by the system process.
Users have been complaining on Feedback Hub about how their PCs
suffer from extremely high CPU usage, which affects the
performance of the entire machine entire computers suffering as
a result.

Windows 10 KB5001391 update, which was published recently for
version 20H2 and 2004, has brought a number of important fixes.
It appears it has also introduced a fix for a high usage bug,
but the origin of the problem remains unclear.

The problem appears to be a race condition where two or more
processes affected the performance of the system unexpectedly.
When the bug is experienced, a sharp spike in CPU usage is
noticed and deadlocks occur.

KB5001391 update seems to have addressed this race condition.

Windows update fixes broken Start Menu

In 2020,
Microsoft showed off its theme-aware Start Menu with a
streamlined design that removes solid colour backplates. For
some users, Windows 10 version 20H2 broke live tiles and users
reported blank tiles after updating to the newer version of the

KB5001391 has addressed an issue that causes blank tiles to
appear on the Start Menu with the following names:

  • ms-resource:AppName
  • ms-resource:appDisplayName

The bug affected both first and third-party applications.

These blank tiles appear for the installed apps after users
apply the monthly cumulative updates. Although the live tiles
are automatically restored after approximately 15 minutes, the
problem is still annoying as it kills the basic functionality
of live tiles and it was flagged by a lot of users on Feedback

This optional patch addresses the problem and prevents these
blank tiles from appearing on the Start menu.

Start menu issuesIn our tests, we
observed that the issue has been fixed and tiles are no longer

The patch is currently available to all users using version
20H2 and version 2004 of the operating system. If you want to
test out the fix, you can do so now via Windows Update >
Optional update and you don’t have to join the Windows Insider

To download and apply the hotfix, check for updates in the
Settings app and click on the “Download and install” button
beneath the “optional updates” section.

It’s important to remember that this is a preview cumulative
update and users should be prepared for unexpected issues
before proceeding.

Alternatively, you can wait for the May 2021 Patch Tuesday
update, which is likely to be more stable and is currently
scheduled to launch on May 11.

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