I am 100% sure this isn't time saving, but I want to show you guys something.

So, this one requires Big Mario(or Super Mario to do this)

In the video shown, I ducked under the bricks and while I was still accelerated, I quickly pushed the left button, which caused me to be pushed forward by a heck ton of pixels, which was more than enough to get through the pipe.

I know it's not time saving, but I do have to admit, it was a pretty good find,

(Unless someone else had found it before I even typed this out.)

EDIT: Turns out, people already found it before I did. Feelsbadman. But hey, atleast I can give myself a pat on the back for finding a glitch without using Google.