Your jumping speed is determined mostly by your Body or how strong a character is.

You can jump up to 1/3 of your Walking Speed. Then for each Body you have you increase it by an additional 2ft.

Other abilities can also try to increase your jumping speed.

1. Jumping could help you avoid traps, or hazardous terrain that is on the ground.
2. Jumping does not provoke Opportunity Attack Abilities.
3. You still have to try to Overrun creatures if moving through hostile creatures space through jumping.
4. When jumping the minimum angle leaving is typically 30 degrees, and the entry is also 30. If it is steeper the angle will be reflected as such in the widget.
5. You either have to land back on the ground, or a structure or surface that is on the ground, subject to Falling Damage.