GIFs can be used to simulate that something is loading in the background, or results are being computed.
To achieve this result, create a new page, before the result page that should be delayed by the loading animation, with an Image Element + a Timer Element.
In the Image element, upload your favorite animated gif (Check the copyright!).
Hide the Timer element and set the time to the desired effect level you wish.
In the example above, the time is set to 5 secs. After this time, the quiz will automatically continue to the "Thank you" page.