Changing lanes makes sense when there is a substantive reason to do so. The other lane moving faster is not substantive; it's observation. If you have no idea why it's moving faster, you have no idea whether switching will help.

But if you drive the same route every day, it is possible to find inflection points in the traffic patterns, where you want to go one way and a significant portion of the traffic wants to go another. Optimizing around these points is a good reason to change lanes.