Multiplexed 7-segments. Can this code be faster?

Other Hardware LEDs and Multiplexing
2

To get more brightness, spend more time with the LEDs on:

const unsigned long delayWhileLit = 1;  // Increase this until you get flickering, then reduce a step

void writeMinutes(){
  PORTD = segBytes[minLeft]; // display left digit
  digitalWrite(leftMinAnode, ON);
  delay(delayWhileLit);
  digitalWrite(leftMinAnode, OFF);
  PORTD = segBytes[minRight]; // display right digit
  digitalWrite(rightMinAnode, ON);
  delay(delayWhileLit);
  digitalWrite(leftMinAnode, OFF);
}

void writeSeconds(){
  PORTD = segBytes[secLeft]; // display left digit
  digitalWrite(leftSecAnode, ON);
  delay(delayWhileLit);
  digitalWrite(leftSecAnode, OFF);
  PORTD = segBytes[secRight]; // display right digit
  digitalWrite(rightSecAnode, ON);
  delay(delayWhileLit);
  digitalWrite(rightSecAnode, OFF);
}