At the risk of sounding like a competitive Strava geek (I’m not) is it possible to compare 2 or more activities in Garmin Connect? My commute can be on the same route and therefore I can make a direct comparison and see where my performance is declining. For instance by flicking between tuesday and thursdays rides to work I can see I spent more time in Z3 on tuesday but it could have been I was slower up the hills today etc etc.
In Strava you can sort of do this. If you select your ride then go to the segments. Select which segment you want to see, then select your results. This will show you the date ridden and the time it took for each effort.
This only compares segements and not full rides.
Obviously no good for you if you want to see it in Garmin connect as opposed to Strava.