Of all the items in The Wind Waker, one of the most useful is bombs. Bombs can be obtained after visiting Greatfish Isle, and it is possible to get to Greatfish Isle early (early being before the completion of Forbidden Woods), saving time in an Any% speedrun.
After you obtain the grapple hook, you can Item Slide and superswim to Greatfish Isle with relative ease. If you have completed Dragon Roost Cavern and have the Wind's Requiem, you can set the wind to south after the Greatfish cutscene to trigger being able to enter the King of Red Lions. When you enter the King of Red Lions he will autosail you to Windfall since you haven't completed Forbidden Woods yet as completing Forbidden Woods is the trigger for being able to sail anywhere on the great sea.
Note: In a TAS, it is possible to perform a superswim without item sliding. Because of this, you can get the bombs directly after completing the first visit to Forsaken Fortress.