Making use of the GPU to render huge amount of objects

[ErraticGenerator]

One way to control when to run draw() manually is to use noLoop() and redraw():

function setup() {
  createCanvas(400, 400);
  background(220);

  noLoop()
}

function draw() {
  ellipse(random(width), random(height), 30, 30)
}

function mouseDragged() {
  redraw()
}