In a word, glacial. But this is about what is reasonable to expect of my running right now; this is a PR, though the two 10ks I have run had monstrous climb. I haven't raced much at this distance, and I was wary of going out too fast. I decided to run a conservative first two miles, then ramp up and push; there wasn't much of a difference between my initial effort and my ending paces apart from the downhill. I did have a little difficulty breathing despite my cetirizine, so I might find a little time in a non-allergy race. The climb was very mild.
About 5 km into the race, I started hearing a guy chatting with a child; I figured he was on a bike. Shortly thereafter, a man pushing a stroller pulled up beside me and gradually edged ahead of me. He looked speedy and strong. I stayed within about 10m of him until the last km, when I kicked ahead of him. After the race, according to a friend of Stephen Petrikalis, the guy is legit, though I think he was just out for a morning tempo run + munchkin and wasn't entered into the race. I finished tenth out of 487. The pace quartiles were 7:44/mi, 8:38/mi, and 9:31/mi.
Graceful like a charging hippo.