Find the maximum supply voltage the servo is rated to, then get an external BEC which is rated at that level. (Don't forget lots of amps too.)
Then connect the BEC to the battery. And the servo power supply leads (and the control lead to the RX of course).
Or buy a faster servo.
(Or get an ESC with adjustable BEC, thats what i have on my 8th scale ESC)
You could also experiment with longer or shorter servo arms, trade off between torque and speed. Or mucking around with other bits of the steering geometry.
Or settings on the TX/RX to improve/reduce signal delay.
Or just get a better servo, polishing a turd is possible, but not generally as effective as doing it properly.
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