Keep in mind every time you savewarp you have to recall Tingle. If the savewarps save approximately 10 seconds combined, then it is worth it to do it SS. Furthermore, it would probably be best to do the Tingle balloon trick in the first room, since you already need to call Tingle to save Makar anyways.
Saving after shooting the cauldron saves running across the whole room, then next room with the WGA stone and the wind room. If you savewarp you just have to walk to the cauldron. This must save a minute or so.
Saving after the miniboss saves using the hookshot, hammer the switch and then exit the room. It also saves hookshoting all the way up. Starting from the beginning untill you get to the room where Makar usually get caught must be 10 seconds faster atleast.
I don't think that saving after the small key saves any time but it makes getting to the boss and doing the boss perfect ALOT easier.