It is moving forward at 10 miles a minute. It certainly isn't moving sideways that quickly. In fact, its course is pretty consistant. The winds at altitude are pretty strong as evidenced by how quickly the contrail drifts. In order to counter the southerly wind as the aircraft moves east, it would actually have to turn into the wind to maintain a consistant course. Think about a boat crossing a fast moving stream. If it doesn't point into the current, it drifts downstream.
Then why does the multiple picture overlay show it making far more progress sideways, to the south, than forward, to the east?