The ultimate servos would now be the TGY-605BL, Goteck HB1621S. Less torque but fast.
These servos might be fast enough for jumping robots. Unfortunately, they may have been discontinued because of overheating. There are no brushless, high speed servos in production. The next level in speed are the TGY-615BL & Goteck HB1623S
https://hobbyking.com/en_us/turnigytm-tgy-615bl-brushless-ds-mg-servo-12kg-0-08sec-60g.html
The 1 month shipping time & risk were too high & led to a cheaper brushed servo 1 week away.
https://hobbyking.com/en_us/hks-9257-high-speed-servo-4-5kg-0-07sec-25g.html
Before then, the Futaba was run at higher voltage, which yielded no difference. Frequency domane feedback has been the biggest win. Removing the servo saver traded erratic swerves for oscillation.
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