I've been doing a lot of hunting for new strats as of late and have found several things. Some things only save half a second or maybe a couple seconds, and I won't make a video and list each one of those here, but I will post significant time savers. I'll continue to add more as they're found.

Things found so far:

5-5 3rd star coin strat (saves 6 seconds):

7-ship blind (saves ~25 seconds but requires an additional star medal somewhere else = ~10 seconds):

Total time saved: 16 seconds

the first one seems good but the second one i think its just for those who REALLY run the game, not me Kappa

Dude these are amazing saves! The first looks like the difference between n00b strat ad "i know this game a bit and am good " strat lol.

the seconds video looks like a "dude i am so gud like omg i is pro" strat. aka not me (I can't even play this cos my DS broke D: )