Orbital speed is the speed of an orbiting body around the center of gravity of the system, i.e., around its barycenter. For a given pair, the further apart, the lower the orbital speed.
Earth's orbital speed as it orbits the Sun is about 30km/second, while Jupiter's is about 13km/second. The Moon's orbital speed around the Earth is about 1km/second. Artificial satellites around Earth vary from around 7km/second for a low orbit to 3km/second for a geostationary orbit.