*When you jump down from a ledge that's at least 2 blocks high, you are forced into a crouching state for 10 frames. You can avoid this by just jumpingimmediately after making contact with the ground. Every time you jump means one less frame you would have to crouch. Walking off usually avoids this crouching state entirely, but wastes 1-2 frames for every ledge you walk over.

*Jumping does have less frames then the walking animation and can reduce lag on some screens when a lot is going on. When you jump immediately , you can take off without seeing a single standing frame. This is a hart difficult thing to master because pressing jump to too early will result in no jump.