Simple: It was encoded with a lower average bitrate. A lot of people struggled to play 1.0 smoothly, so we encoded the later version at a lower bitrate and heard fewer complaints.
Yeah, I noticed that. You have implemented a more dynamic bitrate compared to V.1.0 which was more close to 80 Mbps regardless of content, whereas V.1.4 jumps all over the place and actually has a higher bitrate compared to V.1.0 where it is needed (i.e. bright scenes) and much lower when there is much darkness in the image.
Thanx for the response.