The hookshot can be used to reach the chest directly from the left ledge, bypassing the need to travel through the pot switch room. Out of the doorway, only one frame of diagonal movement is needed for the hookshot to hit the chest.

Walking to the chest is faster than using the hookshot or dashing downward.

It's possible to save up to 2 frames by moving slightly diagonally down+left after opening the chest instead of leaping straight left off of the ledge.

Moving diagonally for 3-5 frames will save 1 frame, and moving diagonally for 6-8 frames will save 2 frames. Moving further downward than that, however, will negate the time save entirely.

Additional time can also be saved by doing a quickhop, if the boots are available.

After climbing the stairs, holding diagonally up+left slows Link's movement down from 1.5 pixels/frame to 1 pixel/frame, so you'll want to hold cardinal left until you are clear of this drag effect. It is safe to diagonal starting from horizontal coordinate 1558 -- one full tile to the left of the stairs.

Despite the drag effect, it is still possible to gain time with an aggressive wallpump against the ledge, but this is not recommended outside of a TAS setting.