Gear VR Loading screen freeze

Hi,

i am making a loading screen for my Gear VR project. I also made a custom loading/splash screen. It runs very good.

It contains two scenes: 1. the loading scene 2. the main scene

The only problem is that during the loading process the loading scene freezes in the end for a couple of seconds. (you can still move your head but the frame stays in one place) after that the main scene loads normally. The main scene contains a 4k 360° Video.

I am using the following code:

 void Update () {
     if (!mainLoaded) {
         mainLoaded = true;
         Application.backgroundLoadingPriority = ThreadPriority.Low;
         StartCoroutine (LoadMain ());
     }
 }

 IEnumerator LoadMain () {
     AsyncOperation loadOperation = Application. LoadLevelAsync (1);
         if (loadOperation.isDone) {
             yield return loadOperation;
         }
       }

Is there a way to get rid of this short freeze?