The very best humans can only manage ~20kph for 2.05 hours (WR: 42.2km in 2:02:57 giving 20.59kph). Beyond that, the 50km WR is down to 18.3kph; 100km WR is 16.1kph; etc.
Further, Olympic paces are maintained by people getting aided with sports drinks at regular intervals etc. It's very different from the conditions primitive people would have lived.
Endurance hunting is far more effective in very high temperatures so it's use as likely limited.
In all animals strategies work together to establish a desired outcome. Human strength does not come from intelligence, intelligence is simply what allows us to coordinate in large groups. The actual strength comes from the large groups.
Again, it's heart wrenching to watch them take down elephants and the like, but if you're still interested: https://www.youtube.com/watch?v=ipn5rSQ2PY4
Apples to apples, humans are far superior to these speeds. The best animals for these measurements do crush these figures (by a factor of ~3), but I would expect that the best dinosaurs wouldn't.
> Very large animals are effectively warm blooded by default due to volume to surface ratios cooling is a much larger problem than staying warm.
True, but being "very large" does not really help with either top speed or explosive power. The fastest animals are small (though not tiny, a decent-not-huge dog in size but much lighter) brittle little things. They chase, rapidly inflict a mortal wound, and run away, waiting until it is abandoned to eat. Fast animals, from cheetahs to rabbits are much lighter than their appearance would suggest. The animals with greatest endurance are larger, but humans are, perhaps surprisingly, pretty good at endurance. Clearly we, at one point, hunted like dogs do : not by outsprinting an animal in an intense fast chase, but by wearing it down for hours, slowly closing in for the kill. Most animals should not be able to escape humans using that strategy. Human hunters would make an animal sprint for it's life 10 times, letting it "escape" 9 times.