PROFILER: Texture.IntegrateLoadedImmediately over 150ms

Hello!

Currently my menu buttons are working like this:

 public GameObject loadScreen;
 public AudioClip buttonSound;
 public AudioSource audioSource;
 
 public void MainMenu () {
 loadScreen.SetActive (true);
 audioSource.PlayOneShot (buttonSound);
 Application.LoadLevelAsync ("Main Menu");
 }

When running the profiler and pressing the buttons, there will be a 50-150ms spike, which is caused by Texture.IntegrateLoadedImmediately. What is this and is there a way to reduce the spike somehow?

Thanks a lot in advance!