Form created through Adobe LiveCycle Designer takes too long to open

[renzo_andrich]

I created a PDF form quite complex, though Adobe LiveCycle Designer. Once opened, it works perfectly. However, while it opens quickly in Adobe Acrobat DC (3-4 seconds), it takes excessive time to open  in Adobe Acrobat Reader DC (15-20 seconds, depending on the performance of the computer used). Of course I have saved it as a PDF with advanced Adobe Reader functionality). Has anybody any idea on what the problem is, and how could I reduce the opening time? Many thanks.