Microsoft released a patch for slow CPUs in Windows 10 20H2

Sinziana Mihalache
by Sinziana Mihalache
Sînziana loves getting people to better understand products, processes, and experiences beyond a simple user guide, either in writing or making use of images. She joined the team after a long-term collaboration with one of...
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  • If you've noticed that your CPU gets stuck at a very low frequency, the issue is not on your side.
  • Microsoft is aware of the problem and is testing an official fix.
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  • Find more helpful tutorials in the comprehensive How-To section.
slow CPU bug windows 10

At the end of last week, Microsoft released the 20H2 Build 19042.608 (KB4580364) to the Insiders and the Beta channel. Among others, it fixes a bug in the CPU values reported by many users on dedicated forums.

More specifically, users noted that with certain processors, the CPU frequency remained stuck at .79 GHZ or lower, although it was designed to go above that.

[…] My CPU is designed to go up to 4ghz with turbo and 2.4 GHz base. For some reason when I do a forced shutdown it seems to fix the problem of the CPU not being able to reach its designed speeds. However, when I put the computer to sleep, shut it down normally, or restart the computer all via the start menu (the values are OK, e.n.). It brings up the problem of the CPU not being able to go to designed speeds.

The above-quoted user mentioned that he is using an FX505GT-US52 Asus laptop; another user with the same device model confirmed the issue.

A known bug that Windows 10 20H2 ignored

While most Windows updates cause high CPU usage, over the past months, incorrect CPU frequencies have been oftentimes reported and the much-awaited October 2020 update hasn’t brought a solution.

With this new build, Microsoft acknowledged that certain processors display the incorrect CPU frequency and that this release should fix them.

It’s unclear how widespread the issue is. And nevertheless, the fix is not yet available for the general public.

Unfortunately, there are no workarounds to this issue. One thing you might try, in case your CPU gets stuck or runs slow, is to do the following:

  1. Open Control Panel.
  2. Go to Edit power plan under Power options.
  3. Select Change advanced power settings.
  4. Make sure that both values under Maximum processor state are set at 100%.fix slow cpu
  5. Make sure that both options under System cooling policy are set as Active.

One thing you should keep in mind, though: the slow CPU issue isn’t caused by the recent update. On the other hand, if you’ve already installed it, here’s the most common problems you might encounter and possible solutions.

If you already installed the mentioned build version on your computer, tell us more about your experience in the comments below.

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Pretty much stuck with this issue on ASUS ZenBook 14 UX433FA. There is also an error while trying to uninstall recent Windows security updates, so no returning back. Touchpad also don’t work, but the system is very very slow up to the point it’s not usable. Losing 5 hours today on solving, it looks like it going to take a couple of days…

Dell XPS 15 0550 stuck with CPU at 0.78Ghz, basically a brick. Tried the power options but no joy there. Reporting as Windows 10 1909 with all current patches. Tried removing KB updates but does not fix the issue. Tried applying all Dell updates but still stuck at 0.78Ghz

Hi Strato5 you can fix the issue if you are an administrator on your device go in the registry to the following location. Right klik Powerschemes change the permission, click on advanced, give the administrator owner ship on the registry by changing system to administrators. mark the option to set this on all sub keys. Next go to permission and give the administrators full control permission. Next change the ActiveOverlayAcPowerScheme and ActiveOverlayAcPowerScheme to ded574b5-45a0-4f42-8737-46345c09c238

Close the registry and reboot your machine now you have full cpu power again.


Hey mark !

My PC is not running to its full potential. Installing something takes ages now. Same for unzipping files.

Will this save the day ?

Could you explain a little more in detail on how to fix this ?

I appreciate it.


Our brave new world. Customers fix a company’s self-created problems??? This 20H2 update and the countless “guesses” by everyone outside MS to solve the problem with what is clearly bad MS code is a waste of everyone’s time not to mention business productivity.

The best solution is to install an older version of Windows 10 (or 7 for that matter) that isn’t buggered up so bad, then lock it down so it doesn’t get corrupted again by “updates” that are cancerous. It is so silly that anyone would feel compelled to keep using something that is broken for no reason other than it is newer. That’s not a good enough reason.