FBX imported not play the animation

Questions
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4

I need a suggestion about this task. As I wrote I have an array of scenes, one for each imported FBX. to store all the animations I used the scene.userData.mixer and scene.userData.action. Is this a good solution?

The animate method becomes:

   animate: function () {
      this.render();
      requestAnimationFrame(this.animate);
      const delta = this.clock.getDelta();
      this.scenes.forEach(function(scene){
          scene.userData.mixer.update(delta)
      })
 },

It works, I have all the “single” scenes playing in each DIV. But I noticed the speed is too fast. Why?