One of the most effective ways to improve your brevet times in randonneuring is reducing the time you aren’t actually moving. This tool shows where you stopped for more than 5 minutes during your ride, along with overall stats about the time you spent off the bike. Learn more
To analyze your stops, upload a GPX file of your ride. The easiest way to get this is to download it from Strava or RideWithGPS. Other sources should work, but I haven’t tested them.