If you shoot the first Pyrup you meet with a slingshot pellet, the Pyrup will immediately run into it's hole and the cutscene showing you the Pyrup won't play when you jump down. You can then roll past the Pyrup hole before it starts shooting fire.
It is possible to use the bomb flowers near the first Pyrup to drain the lava surrounding the Mogma Turf early. First throw a bomb flower up on the ledge near the two skulls, then pick it up and throw the bomb over the wall to destroy the plug. You can then immediately enter the Mogma Turf.
The angle and positioning on the second throw is precise; you need to be about three steps away from the wall on the right, and the angle should be as close to the wall as possible.
The best strategy for the Digging Mitts fight involves gathering all of the Bokoblins in a small area and destroying them with a single Skyward Strike. Start by running through the room diagonally towards the back right corner. Climb onto the wooden platform and move back along, charging a Skyward Strike. Once you get the attention of the Bokoblin leader in the corner, drop down and run towards the wall, then turn and shoot a horizontal Skyward Strike. If the Bokoblins have gathered correctly, they will all fall to that Skyward Strike.
If some Bokoblins are left alive, you can continue to jog back towards the Mogma, charging a second Skyward Strike to finish off the stragglers.
By luring a bokoblin over to the platform above the sandy slope key piece location and then having it hit Link after he attempts to run up a section of the nearby wall, it's possible to get out of bounds and reach the last 2 key pieces faster than going around Eldin the normal way. This also allows access to the entire out of bounds area in Eldin Volcano, though this is currently not useful in any other capacity. Note that the timing for running up the wall is tricky since you need to anticipate the bokoblin attacking Link. If you try to run up after the bokoblin already begins swinging, the bokoblin will hit Link too early.
Upon arriving at the Volcano Entry with Scrapper, return to the sky by the nearby bird statue. Land back down at Temple Entrance, then deathwarp with bombs. This will warp Scrapper to you, allowing you to skip the first half of the escort.
To reach the Volcano Summit from Earth Temple, use your bow to kill the front left Blue Bokoblin, then move to the left of his hut; the others should leave Scrapper alone. Hit the Iron Shield Moblin with four charged bow shots, then run up his shield and jump over him. Seven slashes and two spin attacks will defeat him.
Make sure Scrapper is following you here, then hug the right wall of the tunnel while jogging (not sprinting) forward. Once the Bokoblin Archers see you and cry out, start sprinting and pass on the left side of the Iron Shield Moblin. From there, good movement to the Volcano Summit should let you reach the loading zone before the enemies destroy Scrapper.
Once in the summit, hug the right wall, then briefly duck into the archway on the right before continuing. This activates a small group of Fire Keese between the entrance and the two Lizalfos ahead; the movement is designed to have Scrapper avoid the first larger group of Fire Keese at the entrance and get stuck on the smaller group. You can then sprint as quickly as possible to the loading zone leading to the Fire Sanctuary, and should reach it before Scrapper is destroyed. This is the most inconsistent part of the escort.
It is possible to use a sidehop to skip the first Bokoblin guard. After talking to Plats, climb the ledge and run to the fence corner at the very edge of the lava. Turn to face the fence and sidehop. If you have the right angle, you'll land next to the fiery ash on the lower level and can run to the next digging spot.
When Bokoblin Guards are stationary, it is possible to sprint past them without being caught. This is particularly useful on the two Bokoblin guards after the Gust Bellows; they can be run past, avoiding having to wait or use the Gust Bellows.
After obtaining the Whip, you can skip using the peahat to get over the gate near the Volcano Ascent statue by jumping off the right-hand side of the bridge at the right angle. Done correctly, Link will land on a small ledge, then jump again and grab the ledge on the other side of the gate.
Using precise Brake Sliding it is possible to push a bomb flower all the way over to the rocks blocking the air vent to the upper level of the volcano, thus gaining you access to the fourth and fifth key shards early.
While this saves about 40 seconds, it is clearly a TAS-only trick.
It is possible to use an Extending Blow to skip to the fourth and fifth key shards from the first Bokoblin huts. After collecting those, you can resume your normal climb to collect the first three key shards.
While possible in real-time, this trick is quite inconsistent, and only saves about 2 seconds over the normal route. Thus, it is generally considered to be either unusable or a segmented-only trick. A TAS would use the above method instead.
At the end of the Bokoblin Base segment, it is possible to skip the cutscenes showing the drawbridge lowering through a series of short jumps.
These jumps are extremely precise and save only a short amount of time; thus this would be considered a TAS-only trick.
If you've managed to make it to the Temple Entrance without blowing up the first bokoblin tower, going back down can become difficult. It is however to sidehop from above and reach the other side of the lava pit where the tower is to still reach Volcano Ascent.
A consistent way to get the angle is to grab the ledge, climb up, go in the corner and sidehop left.
It is possible to open the whip chest while the searchlight tower is still up. This is not faster, especially since both the gust bellows and the clawshots are required items in Sky Keep.
Once you obtain the Gust Bellows in Bokoblin Base, you can use it to distract Bokoblin guards. Z-target the Bokoblin and blow the Gust Bellows in its face, then circle around it and back away. When you're far enough from the Bokoblin you can continue on normally.
After retrieving your adventure pouch in Bokoblin Base, head over to the right and climb up the walls until you get to the boulders blocking the sand slope. Sprint towards the wall on the left to climb it and jump back down near the bird statue.
This is not used in runs because a deathwarp after the adventure pouch is faster.