Hi,
Garmin Edge 830Software 9.10GPS version 4.8.0TSC version 0.24.00My Garmin is slow. When i using the navigation i cycle before the dot in the screen. So i missed many turns.
(And i'm not cycling to fast ;-)
Mine is slow too. I use plotaroute.com to make routes. Plotaroute.com allows you to adjust the distance before a turn that warnings are displayed. I back mine up 100' which works okay.
Got the same issue, using it connected to an android phone for the audio announcements.