¿How to slow down servo speed?

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#include <Servo.h>

Servo servo;

bool servoMoving      = false;

const byte sensor_pin = 7;      //+5V---[Sensor]---GND
const byte servo_pin  = 2;      //servo pin

byte moveTo           = 0;
byte currentLocation  = 0;
byte servoSpeed       = 10;     //10ms between increments
byte servoIncrement   = 2;      //degree between servo movement

int val;                        //sensor
int incDec            = 1;

unsigned long servoMillis;


//*******************************************************************
void setup()
{
  pinMode (sensor_pin, INPUT_PULLUP); //sensor

  servo.attach(servo_pin);

} //END of setup()


//*******************************************************************
void loop()
{
  val = digitalRead(sensor_pin);

  //*********************
  if (servoMoving == false && val == 0)
  {
    moveTo = 0;

    if (currentLocation >= moveTo)
    {
      incDec = -1;
    }

    else
    {
      incDec = 1;
    }

    //the servo is now going to move
    servoMoving = true;

    //start the TIMER
    servoMillis = millis();
  }

  //*********************
  if (servoMoving == false && val == HIGH)
  {
    moveTo = 90;

    if (currentLocation >= moveTo)
    {
      incDec = -1;
    }

    else
    {
      incDec = 1;
    }

    //the servo is now going to move
    servoMoving = true;

    //start the TIMER
    servoMillis = millis();
  }

  //*********************
  //if enabled, is it time to move the servo ?
  if (servoMoving == true && millis() - servoMillis > servoSpeed)
  {
    //restart the TIMER
    servoMillis = millis();

    moveServo();
  }

} //END of loop()


//*******************************************************************
void moveServo()
{
  if (currentLocation == moveTo)
  {
    //we have arrived
    servoMoving = false;

    return;
  }

  currentLocation = currentLocation + incDec;

  servo.write(currentLocation);

} //END of moveServo()
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