Thanks for this.

Note as well that even with wifi scanning off,
if you are not connected to internet
+
if you have at least one wifi network that is set to connect automatically
=
then if you launch for instance a web browser, it will ask for internet connection, so that it will first try to connect to wifi, so stuttering will then appear.

At least this is my experience. BUT this scanning off is a big step forward. Because before I had every 5mn or so, a stuttering.