The fastest real time route in Zero Mission 100% uses a specific trick to break the glass tube in the pirate ship and get a speed boost going at the same time to collect the e-tank below optimally. This video shows off the trick:

From the video description:

Video shows a pretty safe and lenient way of doing the glass tube strat, as well as a faster, but riskier and more execution heavy strat.

This is by no means a new trick or anything, but I figured it would be nice to have a reference since it is a fairly essential part of the most used Metroid: Zero Mission 100% route.

Regardless of what strat you use, the important thing is that you place a power bomb right after transitioning, then stand in the door. You have to run at a fairly specific time to make sure the tube breaks right after you store your speed boost: experiment with what works well for you. The most common cue is to start running when the screen stops shaking. An alternative would be to count to three when the power bomb reaches its furthest point, then run.

For the safe strat, the ledge grab is a good way of making sure you do not fall down after doing the diagonal shinespark. You can also just space jump up right away, but if you are worried about falling down, definitely go for the ledge grab.

For the fast strat, you do not necessarily need to hit both blocks with the space boost, but it's obviously faster. You can jump a fair bit earlier and only hit one block and still save time over the safe strat.