How did you set up your options? Did you use Advanced options for all of them?
You should make sure to use Simple options when adding any option that doesn't effect the price, otherwise it creates a unique product for each variation and in your case for "Leaflets Flat" it would be: 2*12*2*3*2*5*15 potential combinations, so that is 21,600 product combinations handled on that page.
If you give me access to the database I can experiment with speeding it up with that many combinations if you feel it is necessary for your application.