Windows 10 ridiculously slow after 20H2 update [duplicate]

My 1yr old laptop, HP Pavilion 15 has it's CPU, Intel i5-8300H stuck at 0.78 GHz whenever it's plugged and charging, and the moment I remove the charger plug or switch it off, it increases suddenly and keep fluctuating freely, with good utilisation percentage more than 1-2GHz or more as I experience Thermal Throttling.

I tried sneaking into the BIOS to see if I can do anything, but found nothing. I also downloaded Intel Extreme Tuning Utility (XTU) but couldn't control it.

My question is how do I increase the speed to say atleast 2 GHz (fixed, not fluctuating) when it's charging, irrespective of getting thermal throttle, and also maybe even control the fan speed if it does get hot?

Solution 1:

This is a known bug with Windows 10 20H2.

You will either need to rollback your latest update, figure out a way to install KB4580364, or wait for Microsoft to give you a fix using the regular update mechanism.

Here is a page confirming the problem: https://windowsreport.com/windows-10-slow-cpu-frequency/

Here is the Microsoft page that shows ways to get the patch: https://support.microsoft.com/en-us/help/4580364/windows-10-update-kb4580364

PLEASE NOTE that this fix is still BETA (preview) software. You need to ask yourself if you want to install another guess at a fix or roll back.