I followed the instructions from https://www.tenforums.com/general-support/95844-fall-update-v-1709-creates-problems-cpu-usage-desktop-wallpaper-5.html. It worked for me.
Resetting Windows Defender Firewall indeed solved my issue. I did with the procedure indicated in the thread above, Settings -> Update and Security -> Windows Defender -> Open Windows Defender Security Center -> Firewall and Network Protection -> Restore Firewall default settings