Most people agree that PDF optimization has something to do with reducing file size. Sometimes it's about faster rendering. Anyway, optimization is a wide topic and it's certainly worth a closer look.
Single out pages from a number of input documents and re-arrange them in a set of output documents belongs to the daily routine in a document assembly application. At first glance, this seems to be a clear and understandable task. But PDF offers some special features, on which you should keep an eye during assembly.