When you "include" the image in the screen, it needs to be loaded from disk which can take a lot of time (especially with images that big).
What you could do is instead just have the resource path to your image. When the screen needs to be shown, you can start loading in the image in a separate thread and only add it to the screen when it's loaded.
Alternatively you can try to anticipate when the screen will be required and start loading the image beforehand (again the key is to do it on a separate thread).