I don't think it is any different than the effectiveness of a reversing propellor, which is greater at high speeds than at low speeds.
For instance, on a turboprop aircraft, the flight idle blade angle of the controllable pitch propellor normally produces zero thrust at the aircraft's stall speed. That same idle blade angle produces positive thrust when the aircraft is static, but a negative thrust component at speeds above stall.
Immediate selection of reverse at high speed (on a flapless touchdown, say) is very effective, but as the forward speed decays the effectiveness of reverse also decays.