hm.. those seem to be different deer than the ones I was chasing, the ones in the video are running, while the ones I was chasing were hopping. My assumption is that deer accustomed to living in a forest aren't as fast on open terrain (note that in Oblvion the deer are also in a forest).
Bridgekeeper "So tell me, what is the average running speed of a deer?"
You "One running in the forest or out in the open"
Bridgekeeper "I...I don't know that. AHH!"
Ok you're saying the forest would hamper movement right? It works both ways. You would be just as hampered too and it's the deer's habitat. Of course its going to outrun you in every way.
This is getting off topic. getting too literal I'm all for speeding up the animals in Skyrim giving them some realism and making the hostile one's scarier.