I was just running for practice and in 8-3 I accidentally hit a hammer bro and got a mini-mushroom. I could swear that I swam up faster. I am just saying this if this ever helps!

If you think you've found something that can be easily tested like this, actually take the time and do the testing before making a spammy forum post about a potential new strat that could easily be nothing.

to my beliefs it is about 1 second faster with the mini mushroom

Is it faster than the shell though

too hard to tell because of some lag

Looking at the in-game timer, the difference between the two seems hardly noticeable. Even if mini Mario does indeed swim much faster vertically, you’ll unfortunately lose time over shell after the checkpoint.

Wow, an intended game mechanic.

Wow, a name I havent seen in a while