How to suppress images/use placeholders to speed up preview

[OlderAndDumber]

I have a large exam with images in many questions. To economise on space when printing, I swap the question order around. But waiting for the images to download again in preview mode after every change is a real pain! Is there a way to just leave placeholders for the images? There are four container fields, not all of which are needed for each question; I use sliding to close the gaps. Thanks to all who can advise on this. :hmm: