Don't put points into its movement speed if you want to glide faster. It glides as fast you run, so putting points into your movement speed will increase how fast it will glide. Hope this saves you from wasting levels like me : )
In mobile version they don't use stamina while gliding and can glide the player regardless of his weight for example my archaeopteryx has 33kg weight while I had 300kg iron on me , glided just fine from redwood hill to all the way to herbivore island(my base) without any issue... Well there was a problem thou that archaeopteryx would not land as it never ran out of stamina so I had to whistle my Tapejara and get on it to land. This is possibly a bug so use it while u can ;) happy infinite gliding.
P.S. I was not in godmode or infinite stats.