       var particle = new Particle();
        particle.start();
        particles.push(particle);
    }

    measurementReady = true;
}

function Particle()
{
    var angle = Math.PI * 2 * PerfTestHelper.random();
    var velocity = minVelocity + ((maxVelocity - minVelocity) * PerfTestHelper.random());
    var x = stageWidth / 2 - particleRadius;
    var y = stageHeight / 2 - particleRadius;
    var dx = Math.cos(angle) * velocity;
    var dy = Math.sin(angle) * velocity;

    // Create visual element for t