When you first enter Earth Temple, turn and face the entrance and press Z so that the camera is facing the stairway exiting the temple. Then run away from the entrance towards the camera. Since the rising lava platforms are off camera, they won't move until you are close enough to them. This allows you to skip the first lava platform and jump directly to the second, and from there quickly get to the drawbridge gate.
After reaching the first drawbridge, it is possible to use Skyward Strikes to break the ropes on the ground, then jump over a small gap before the strike hits. This causes Link to be airborne when the cutscene showing the drawbridge lowering would trigger, skipping it. You can do this for both ropes on the ground; since the last drawbridge lowering cutscene is longest, it is faster to use the Beetle to break the second rope, and do the CS skip on the last one.
In Harp speedruns, it is possible to skip obtaining the Bomb Bag and proceed directly to the Reverse BiTMagic trick to skip the boulder section. It is then possible (though not easy) to beat Scaldera only using the Bomb Flowers at the top of the ramp. With a good Scaldera fight, this can save about 1:20 over getting the bomb bag.
This is not used in any% speedruns because bombs are too useful for dying to activate BiT; however, in a Harp speedrun the run ends shortly thereafter, and thus skipping the bomb bag is possible.
Using Reverse BiTMagic, the platforms leading to the back half of Earth Temple can be raised without having to push in either peg, thus skipping most of the boulder rolling section.
There are actually two flags that can be used for this trick. The first is pushing in the grave that opens the shed to Batreaux's house at night, while the second is talking to Pipit in the Knight Academy. The latter flag is faster by a significant amount, but requires a file saved at the very start of the game, before speaking with Zelda at the Goddess Statue. A corrupt file also works for this purpose.
After performing the RBM, you must watch the small cutscene before deathwarping to reload the area. Then the platforms will be raised and you can continue.
By using the nearby Lava Spume to get extra height, it is possible to hop off the boulder onto the wall next to Ledd, and then jump over his text trigger and continue to get the Bomb Bag. While you don't have to use the Lava Spume to do this, the extra height makes it easier.
This trick saves a few seconds, but more in English versions since the textboxes are longer.
When using the bomb flower to explode the rocks leading to the Bomb Bag, it is possible to skip the cutscene showing the rocks exploding by entering the small crawlspace when the cutscene would trigger. Although the cutscene does not trigger, if the bomb is close enough to the rocks, they will still explode
It is possible to skip the cutscene at the start of the Dual Lizalfos fight by using the Slingshot to hit one of the two Lizalfos before jumping to the central platform. This immediately triggers the fight, thus skipping the cutscene.
In the boulder rolling segment, there is a lava spout which sometimes blocks the way forward after the Beetle gate. It is possible to Z-target the fire keese in the segment leading up to the gate, turning the camera away from the spout and delaying its cycle to a good position.
This works because the lava spout's cycle doesn't activate until it is visible, so the manipulation delays its start until the right moment.
Peg skip is a way to avoid pushing in the second peg to raise the bridge platforms in Earth Temple. While pushing in the first peg, Z-target at the correct angle. As the peg is about to get pushed in, perform a front hop by pressing A, and for insurance add a jumpslash by swinging the Wiimote. If your angle and timing was correct, you should land on the very corner of the third platform as it rises, allowing you to proceed into the temple.
This saves about 25 seconds.
If you miss that jump, when you push in the second peg, you can do a similar jump onto the middle platform to skip going around.
Sprint partway up the slope to trigger both waves of rocks, then go back down and stand in the corner on the left side of the slope to avoid the boulders (let your stamina refill as this happens). When the rocks fall into the lava, immediately start Stutter Sprinting up the slope. You should have just enough stamina to make it all the way up; if you find you are short on stamina, try ending with a roll to reach the top.
If the boulders respawn as you're Stutter Sprinting, you took too long to start up the slope the second time.
When playing in Hero Mode, it is possible to kill Scaldera in only three cycles of vulnerability using the upgraded Skyward Strike. There are multiple methods for doing so.
This is the fastest method, as the first cycle is very short, and it avoids having Scaldera climb the slope at all. It is also very precise.
The last Skyward Strike has to "double-hit"; that is, you should hit with both the strike and the sword itself. This requires being a specific distance away from the eye.
This method is also precise; missing any of the strikes will cause the fight to go at least four cycles.
It is possible to beat Scaldera only using the bomb flowers at the top of the ramp. This enables the Bomb Bag skip for Harp speedruns. You have to let Scaldera hit the first bombs at the top of the ramp, then use one of the other bomb flowers to roll a bomb down the ramp so that Scaldera will breathe it in.
The combat cycles can be done exactly as in the first method above. You want to avoid having Scaldera start his final cycles, where he climbs all the way up the ramp and rolls all the way back down; if he does this then you must hit him with a Skyward Strike at the bottom of the ramp, and that can be extremely difficult.
After obtaining the Bomb Bag, it is possible to skip the boulder rolling section by using a cutscene to do a Lava Hop to a platform. First, save at the statue on the central island in the lava. Clear the lava spumes out of the way, then place the boulder at the very edge of the range where you can blow up the rocks leading to the lava passage. Throw the first bomb, then as you throw the second bomb, turn and sidehop off the boulder.
Done correctly, the cutscene where the rock wall explodes will play. As the cutscene ends, it is possible to Lava Hop by doing a front hop. If you have a good angle and perform a jumpslash at the height of this forward hop, you can land on the platform with the Lizalfos on the other end of the lava passage. Use the Lizalfos to deathwarp; when you respawn on the center island, the boulder will have spawned at the end of the lava passage, skipping the entire section. You can then proceed directly to Peg Skip.
The setup is as follows:
As there is no presently known way of consistently timing the frame-perfect hop, this trick is generally considered segmented or TAS only.
When you reach the first rising lava platform, you can charge a Skyward Strike and use it to hit the rope controlling the gate on the right side. Once that platform rises, you can jump straight from there to the solid platform, skipping the second rising platform.
This is not used because it is slower than the camera manipulation strategy.