Hello Guys !!!

I created a code about a crazy clock ^^ , when the mouse is down, it change color and make appears a spiral but i wonder 2 questions :
1- why my arrows are less fast when my mouse is down/change blackground ?, it's cool but i don' t understand  because this arrows are doing this, it was not my intention at first, so i would like to understand ^^
2- I tried to create a Mousepressed code to animate slowly the spirale when i click with my mouse but unfortunately i didn't succeed, could you me help please ?

This is my code to illustrate my questions :
float secondes;
float heures;
float minutes;

void setup() {
  size(200, 200);
  smooth();
}

void draw() {
  background(0);
// Dessin de l'horloge
  translate(width / 2, height / 2);
  strokeWeight(6);
  stroke(255,0,0);
  ellipse(0, 0, 200, 200);
 
  // secondes
  strokeWeight(1);
 fill(0);
  secondes +=0.02;
  pushMatrix();
  rotate(secondes);
  line(0, 0, 0, 95);
  popMatrix();
 
  // minutes
  strokeWeight(2);
 minutes +=0.1;
  pushMatrix();
  rotate(minutes);
  line(0, 0, 0, -90);
  popMatrix();
 
  // heures
  strokeWeight(4);
  heures += 0.3;
  pushMatrix();
  rotate(heures);
  line(0, 0, 0, -50);
  popMatrix();
 
  //spirale
  for(float i =0;i<mouseY-100;i++){
    rotate(10);
    fill(0,255,0);
    ellipse(i,0,0.5,0.5);
  }
}

Thank you again for your help !