Line following general question

Projects Programming
10 
void motorsl(){
 
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, HIGH);
  delay(4);
  digitalWrite(motorPin5, HIGH);
  digitalWrite(motorPin6, LOW);
  digitalWrite(motorPin7, LOW);
  digitalWrite(motorPin8, LOW);
  delay(4);
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, LOW);
  delay(4);
  digitalWrite(motorPin5, LOW);
  digitalWrite(motorPin6, HIGH);
  digitalWrite(motorPin7, LOW);
  digitalWrite(motorPin8, LOW);
  delay(4);
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, LOW);
  delay(4);
  digitalWrite(motorPin5, LOW);
  digitalWrite(motorPin6, LOW);
  digitalWrite(motorPin7, HIGH);
  digitalWrite(motorPin8, LOW);
  delay(4);
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, LOW);
  delay(4);
  digitalWrite(motorPin5, LOW);
  digitalWrite(motorPin6, LOW);
  digitalWrite(motorPin7, LOW);
  digitalWrite(motorPin8, HIGH);
  delay(4);
  //digitalWrite(motorPin8, LOW);
 
}

Thats 8 X 4 mS delays each time you call this. Total: 32 mS.

 for(int a = 0; a < 5; a++){
  motorsf();
  }

Multiply that by 5. 160 mS.

I'm surprised it isn't slower. Redesign to get rid of the delays.