You can try putting all your images on page one, resizing them to a small square and covering it with a white rectangle. Then the browser will try to fetch all the images from the server at once. Depending on users’ estimated connection speed, add an OnTimer action to go to the next page and add a “loading…” text in the screen centre.
Or, you can make a JS function that reads the imsmanifest and fetches all images from its file list.
Is there a way to and an OnTimer when all the images have loaded on screen it will automatically move forward. This process will obviously based on the users internet speed.