Stepper following POT - bit noisy

Other Hardware Robotics
3

unsigned int stepDelay = 3; // Controls Velocity of Motor

for(i=1; i<pulseControlCount; i++)
{
digitalWrite(stepPin, HIGH);
delayMicroseconds(stepDelay);
digitalWrite(stepPin, LOW);
delayMicroseconds(stepDelay);
}

166667 steps per second? Which Arduino?