Is it age, lagging fitness or nothing unusual to see only a couple minutes difference between flat out for ten miles and taking a brisk easy ride? I don't race, train or ride centuries - I just ride.
Specifically, it's ten miles from my back door to work, seven of it on a paved path. I have about 300 trips on the commute, hundreds more on just the path, generally at the same time of day. I know the route, habitually slow down at the same places where people will be etc, so there isn't much difference from one day to the next. When there aren't random variations like traffic jams or big crowds it takes 33 minutes (computer moving time) if I'm larking about, 32 minutes if I'm being brisk and right at 30 minutes if I'm doing all I can muster. (I already know that's too fast for a path. I'm careful and slow for peds and passing).
Is it a concern to hit a wall only two minutes faster out of over 30? Is that a plateau thing that's going to take more intense training or does it gradually improve with general fitness? Am I worried about nothing?