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OK, this is actually my own answer to an unwritten question on this title problem chasen today ...
Why there is WUDFHost.exe constantly on some 12-20% CPU?
According to several posts on the net "The WUDFHost.exe process is part of Windows Driver Foundation of Microsoft", and an essential one, if found on %WinDir%\System32 folder. It is pointed to be taking care of "User-mode Drivers".
After checking the drivers on this about half-year old laptop, first 3 most critical ones manually and also updating them, I didn't still note any change on the CPU list. Then I went on checking others automatically this time with the Free Driver Booster 3, and it found some 12 more drivers outdated. So, now I let twice some 3-4 "easy" ones get updated automatically by DB3 and there between checked the actual CPU list, but still no change. But, after an automatic DB3 update of the last "critical/difficult" 5 m/b drivers the WUDFHost.exe was on 0% CPU, great! Note also, that all of the updated 15 drivers were just 3-12 months old.
Edit 18.08.2016 10:30 (GMT+3):
Sorry, to inform, but this cure was a short joy, after Windows 10 was Upgraded from 1511 to 1607 the problem did return, i.e. back to 15-17% CPU, and now the DB3 did recognise only up-to-date drivers ... See below my comments on this.
Edit 18.08.2016 12:30 (GMT+3):
OK, the new troublemaker identified -> Lenovo Quick Optimizer, see below my comment on it, and now this case hopefully finally cleared.
Install the WPT (part of the Win10 SDK: https://dev.windows.com/en-us/downloads/windows-10-sdk), run WPRUI.exe, select "First Level", under Resource select CPU usage and click on start. Now capture 1 minute of the CPU usage. After 1 minute click on Save. Zip the large ETL file (+ NGENPDB folder) into 1 zip, upload the zip (OneDrive, dropbox, google drive) and post the share link here.
– magicandre1981 – 2016-08-17T15:52:24.693@magicandre1981 OK, thanks for the instructions. Now I did the CPU recording with WPR and checked it with WPA, and, ooops ... now the WUDFHost.exe proved to be once again at the 15% level, a few hours ago it was long time at 0% only, as described above ... But, what happened now there between, Windows 10 Upgrade from 1511 to1607 was performed with restart etc.! Now I shall take a break with this, and will come back with a new report first thing on the morning. – PeteVfi – 2016-08-17T17:00:46.280
Sorry, checked once again the status of the WUDFHost.exe on this particular quite new laptop, and as now it is back on the 15-17% CPU level, I have to give up digging more into the far deep in this, due to time limits, and will let it so far be as such ... So, if anyone else has interest on this case, please go on on this, and I would be grateful for some new better real cure hints or solution for this annoying problem ... – PeteVfi – 2016-08-17T22:27:25.730
share the ETL that you captured when you have the issue. Maybe I see more details – magicandre1981 – 2016-08-18T04:27:08.443
OK, please, here you have the link for the captured .zip -> https://dl.dropboxusercontent.com/u/4802168/WPR%20Files%20Lenovo.zip
– PeteVfi – 2016-08-18T07:37:15.623OK, yippee, now the new troublemaker identified, namely -> Lenovo QuickOptimizerIcon.exe ... I stopped it, and then the problem did vanish, and rebooted for checking, and now will uninstall the program. – PeteVfi – 2016-08-18T09:18:15.140
I also posted what I see from the ETL file – magicandre1981 – 2016-08-18T15:40:53.680