Servo Refresh Rate: Arduino Mega

Hello:

I'm trying to use the Arduino Mega to build a quadcopter. I'm using the servo library to drive my ESCs. The default MIN_PULSE_WIDTH and MAX_PULSE_WIDTH are the low and high settings for the ESC throttle. I'm wondering about the refresh rate. What's the default refresh rate for the servos? I see there is a

define REFRESH_INTERVAL 20000

does that mean the default refresh rate is 1/20000 = 50Hz? I need the refresh rate to be > 150Hz for stability. Is it safe to lower REFRESH_INTERVAL in order to increase the servo refresh rate?

Thanks.

Works fine with 10000 (100Hz update) Haven't tried it faster