Traditional stepper motor drivers move one step (turn the motor a small distance) on either the rising or falling edge of the “step pin” (that is, when the voltage on the wire goes from low to high, or high to low). The Trinamic drivers support a mode where it will move a step both when the pin voltages rises and when it falls. Taking advantage of that mode reduces the overhead in the micro-controller.
In addition to the links above, the benchmark updates commit can be found at docs: Update benchmarks after stepper and scheduler changes · Klipper3d/klipper@cf811e5 · GitHub
-Kevin