In Swift a CPU heavy task freezes the app for a few seconds - GLTFSceneKit

Question

In my project, I started using the GLTFSceneKit package to load models. It works perfectly, but there is a method that causes the UI to freeze for 1-2 seconds, and then everything continues.

The code is as follows:

import GLTFSceneKit

var scene: SCNScene
do {
  let sceneSource = try GLTFSceneSource(named: "art.scnassets/Box/glTF/Box.gltf")
  scene = try sceneSource.scene()
} catch {
  print("\(error.localizedDescription)")
  return
}

I noticed that the scene = try sceneSource.scene() line is responsible for the freeze.

How can I fix it so that the app doesn't freeze when it gets to this line of code?