Acer, HP, or Dell laptop runs slow when plugged in but fine on battery power?
However, many users find that the laptop slows down when plugged in.
Fix 1.

Prevent your box From Overheating
Laptop overheatingis an important cause of computer performance degradation and slowdown.
you’ve got the option to use aCPU temperature monitorto check the laptop temperature.
To eliminate this factor, see to it you are using the original adapter of your laptop.
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If this does not apply, use another power adapter that is compatible with your laptop.
Fix 3. that manage how your machine uses power.
Press theWindows + Ikey combination to open Windows options.

Move on to thePower & sleepsection, then clickAdditional power options.
In the new window, select theBalanced (recommended)option.
Encountering a Windows update high CPU usage?

This post shows you how to fix the high disk and CPU usage during Windows update.
Fix 4.
Here it’s possible for you to follow the instructions below to change the maximum processor state.

Step 1.kick off the Control Panelby using the Windows search box.
In Control Panel, navigate to this location:Control Panel\Hardware and Sound\Power Options\Edit Plan controls.
Next, click theChange advanced power settingsoption.
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In the new window, click theplus sign (+)next toProcessor power managementandMaximum process statesequentially.
After that, set up the maximum process state to99%.
Finally, clickApply>OK.
Fix 5.
Here you’ve got the option to see how to run Windows Defender for viruses.
Press theWindows + Ikeyboard shortcut to open parameters.
Then select theUpdate & Securityoption.
ClickWindows Security>Virus & threat protection.
In the pop-up window, click theQuick scanbutton and wait for the process to complete.
Windows shuts down when scanning for viruses?
This post offers you several effective solutions to help you get rid of this issue.
Hope the methods above are helpful for resolving your issue.