The movement of the tectonic plates in the Earth's crust is quite a small amount, at only a few centimetres a year. How fast could the movements of a tectonic plate get up to if an earth-like planet:
Had an inner core made of a substance that emitted more heat (about twice the amount of Earth?)
Had a mantle considerably thinner, allowing magma to move faster along the convection currents
Had a smaller distance between the core and the crust
Please note that these are all criteria for the same planet, but feel free to explain if they cannot fit together to create a feasible one.