System slow-down after windows 10 feature update 1803

My computer installed 1803 feature update on Saturday.  At the time I had on avast antivirus, but the installation went smoothly with no issues.

After the update I immediately noticed an annoying tendency for programs to briefly pause and fade out when I exit them.  Before the update they exited instantly with no delay.  I noticed the computer will also sometimes turn on the fan and the CPU runs audibly though the computer is idle without any scans, updates, or anything running in the background.

I try to open task manager to find what is running, and it reports that task manager is taking up 20% CPU usage, but then sharply falls immediately after opening task manager.  Nothing else takes up more than 1-3% CPU usage.

I have tried all fixes from these websites:

https://www.windowscentral.com/windows-10-april-2018-update-common-problems-and-fixes

https://answers.microsoft.com/en-us/windows/forum/windows_10-performance/windows-10-performance-and-install-integrity/75529fd4-fac7-4653-893a-dd8cd4b4db00

I am now wondering if reverting back to the previous version and reinstalling it with avast uninstalled would perhaps fix my issues.

System specs:

OS Name Microsoft Windows 10 Home
Version 10.0.17134 Build 17134
OS Manufacturer Microsoft Corporation
System Name LAPTOP-LES8F3J8
System Manufacturer LENOVO
System Model 80RU
System Type x64-based PC
System SKU LENOVO_MT_80RU_BU_idea_FM_Lenovo ideapad 700-15ISK
Processor Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz, 2592 Mhz, 4 Core(s), 8 Logical Processor(s)
BIOS Version/Date LENOVO E5CN62WW, 3/9/2018
SMBIOS Version 2.8
Embedded Controller Version 1.23
BIOS Mode UEFI
BaseBoard Manufacturer LENOVO

 

Question Info


Last updated August 25, 2019 Views 3,684 Applies to:

Please see this thread for help with this common issue on the current update


https://answers.microsoft.com/en-us/windows/for...

If that doesn't help I would suggest to 

Rollback Windows
In order to rid yourself of these issues and return to your previous stable build it is recommended that you RollBack to your previous version of Windows. To do this please follow these steps

"Open Start > Settings > Update & security > Recovery > under Go back to my previous version of Windows 10, click Get started. 

or 

Press Control + Alt + Delete 
Click Sign out 

At the Sign In screen, hold down the shift key on your keyboard while clicking the Power button on the screen 
Continue to hold down the shift key while clicking Restart 
Continue to hold down the shift key until the Advanced Recovery Options menu appears 

Click Troubleshoot 

Click Advanced options 

Click Go back to the previous version of Windows"

This information was obtained from the following official Microsoft Help document
https://support.microsoft.com/en-us/help/12415/windows-10-recovery-options

And from the following thread

https://answers.microsoft.com/en-us/windows/forum/windows_10-windows_install/how-to-recover-restore-your-previous-version-of/94368560-9c64-4387-92b9-82a9234216ad

NOTE: when using recovery options be sure to watch for and select options to "keep your personal files and folders" that way you will preserve your important data

I hope this helps. Please let me know if I can be of further assistance

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1. Run Built-in & Guided Walk through Windows Update troubleshooter
Built-in : Windows Key+X > Click Settings > Click Update & security > Click Troubleshoot > Click Windows Update > Click Run the Troubleshooter

Guided Walk though - https://support.microsoft.com/en-us/help/10164/...

2. Run through Windows 10 Performance and Install Integrity Checklist by Greg Carmack, MVP to make sure that your Windows installation is rightly set up and optimized. Take all recommended steps outlined there to have best experience -

http://answers.microsoft.com/en-us/windows/wiki...

3. Last option - I would recommend that you should consider rolling back 1803 to 1709 and defer it from happening as there seem to be issues. Try to install this after a month or two when more cum packs are released stabilizing 1803 further. (Roll back can be done only if you were upgraded during last 10 days i.e. you are within 10 days roll back window)

Roll Back - Windows Key+I > Update & security > Recovery > Under Go back to previous version of Windows 10, Get Started > Follow onscreen directions

How to block the Windows 10 April 2018 Update, version 1803, from installing - https://www.computerworld.com/article/3232632/m...

Disclaimer - This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
Best regards
Vijay Verma

Timezone: UTC+05:30, PST+12:30
Availability Hours (UTC) : 05:00 AM - 05:00 PM

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Thanks for the reply guys, now I have a much bigger problem from the 1803 update-- no internet.  I will be happy if I can simply fix the internet problem now.

I posted another question about it:  https://answers.microsoft.com/en-us/windows/forum/windows_10-networking/no-valid-ip-configuration-after-windows-10-1803/0dc94519-abec-49b4-9de3-f207a6798f0e

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