The majority of the time difference here is on the final boss - you could probably gain 40 seconds or so on him. However, there are a other places that have mistakes that should be caught during a TAS - for example, you take damage in level 6 when trying to hit an enemy, and some boss hits don't happen as early as they could. It also seems like jumping in the overhead levels slows everything down a bit - I didn't notice that before (and haven't confirmed it, just looks slower). I wonder if the earlier bouncing balls in the first level's boss chamber can be reflected forward and used against the boss or not. I don't remember trying that. If you're interested in TASing another Skate or Die game, I bet the NES version has some improvements hiding in it :)