I've just done some service by using Advanced System Care 11 Ult. and found an interesting service tool from Microsoft. I let it run and it took about 15 to 20 minutes to complete.

       I've got the feeling that the PC is faster now. 

   

To use the Deployment Image Service and Management Tool (DISM)

1. In the search box on the taskbar, type command prompt, press and hold (or right-click) Command Prompt, and then select Run as administrator> Yes.
2. At the command prompt, type dism.exe /Online /Cleanup-image /Restorehealth (note the space between "dism.exe" and "/" and each switch (/)).
3. If DISM finds corrupted files and replaces them, restart your PC and see that improves performance.

 

 

To run System File Checker (SFC)

1. In the search box on the taskbar, type command prompt, press and hold (or right-click) Command Prompt, then select Run as administrator > Yes.
2. At the command prompt, type sfc /scannow (note the space between "sfc" and the "/").
   Scanning will take a few minutes.
3. Do one of the following, depending on the results of the scan:
   • If SFC finds corrupted files and replaces them, restart your PC and see if that improves your PC’s performance.
   • If SFC doesn’t find corrupted files or finds corrupted files but can’t replace them, try using the Deployment Image Service and Management Tool (DISM).
   •  

Website: https://support.microsoft.com/en-us/help/4002019/windows-10-improve-pc-performance

I'd be surprised if running DISM and/or SFC resulted in speed improvements, as these utilities are designed to find/replace corrupted or missing protected system files with a known good version.

 

And to improve pc performance, the website link you listed gives better actionable items (with expandable instructions):

 

1. Make sure you have the latest updates for Windows and device drivers
2. Restart your PC and open only the apps you need
3. Check memory and memory usage
4. Check for low disk space and make some room
5. Restore your PC from a system restore point
6. Disable unnecessary startup programs
7. Check for and remove viruses and malware
8. Check for corrupted Windows system files
9. Adjust the appearance and performance of Windows
10. Adjust or turn off OneDrive sync
11. Reset your PC

Go big or go home, man. TronScript