Moving objects along curve very slowly with instanced curve modifier (InstancedFlow)

Questions
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5

I have modified the code from MotionAlongCurve and also use delta. Then it is also jerky at delta / 100 but fluid at delta / 10.

const geometry = new THREE.BoxGeometry( 0.2, 0.08, 0.05 );
const material = new THREE.MeshPhongMaterial( { color: 0x99ffff, wireframe: false } );
const objectToCurve = new THREE.Mesh( geometry, material );

const flow = new Flow( objectToCurve ); 
flow.updateCurve( 0, curve );
scene.add( flow.object3D );

const clock = new THREE.Clock();
let delta;

animate( );

function animate( ) {

    delta = clock.getDelta( );
	requestAnimationFrame( animate );
	//flow.moveAlongCurve( 0.0006 );
    flow.moveAlongCurve( delta / 100  );
	renderer.render( scene, camera );

}

But why delta at all and not a fixed value?

Maybe it is worth to test another version, e.g. with quaternions.

CarRacingQuaternion