The PdfDocumentLoadingPolicy property allows you to optimize the PDF Viewer's performance by selecting the mode that is the most appropriate for your scenario.
Modes that support additional features:
InMemory - Slower initial loading, more memory consumption, better performance.
InMemoryOnDemand - Faster initial loading, less memory consumption, slower performance on initial feature requests. Once the end-user requests all additional features available for a document, performance matches the InMemory mode.