I had a similar question in this forum : https://forum.myrouteapp.com/topic/9685/snellere-route-tijdens-navigatie-modus
The annoying thing is that it advises that it has found a quicker route by 1 minute. That is not really quicker, It would be quicker when it message you if it 5 minutes or more. One minute is (in my opinion) not worth mentioning. 5 minutes or more is.
I don't know if it is possible for the user to change the amount of minutes?
Would be great though.