He obviously has massive acceleration, and see how high his trajectory grows and he's not even neared 5km??? And yet he's perfectly stable. But his TWR is obviously through the roof! And he has to dump his 2nd stage with so much fuel? Even considering his landing, at that point he should at least have been nearly empty already. And anyone who does 450m/s before they reach 8km is flying in a vacuum. He throws off stage after stage with fuel left. REALLY???
Now this is its true performance. Notice the difference in speed throughout. Identical rocket. Also notice at separation the two stages pull apart now. That is because of drag and mass differences. Something that did not happen in the first video.
I just want to help him learn to do it properly He obviously does not know about the drag bug, or else he'd never put so many Titans on one sub-kiloton rocket.