I don't have a Mega, but the Servo library notes say that 12 servos are supported for the standard Arduino, and 48 are supported for the Mega.
Personally, I have had no problems with eight servos and serial on a Nano.
I don't have a Mega, but the Servo library notes say that 12 servos are supported for the standard Arduino, and 48 are supported for the Mega.
Personally, I have had no problems with eight servos and serial on a Nano.