I don't understand why the default mount (sword mount) gives you 80% fly/ground speed but the horse mount (the next one you get) is only 70% ground. If it was like World of Warcraft where flying will be faster, then I could understand; however, that definitely isn't the intention behind it.
Additionally the masked panda mount is only 30% ground speed. 
Could we have some consistency to mount speed?
To be honest, it's not illogical.
When i played on beta, i was thinking that the flying sword we had at start... we shouldnt have it before max level, and i think the game was design for this.
And then you level up lvl 20, you have your first mount, the 70% horse, then you up 37, and you have 80% ground & flying.
And the panda is just a funny mount to use to slack.
What i find illogical is the fact we have flying mount before ground one.
When the game originally released, there were no flying mounts so the horse was the first free mount you got.
Most mounts have 80% speed (ground or flying) so that horse is just a remnant of older times.
