Q:
Is there anything I can do to speed-up rendering or viewing of some
PDF (typically large scanned PDFs)?
A:
Regarding scroll performance you may want to experiments with the
following options (in different combinations):
pdfview.SetImageSmoothing(false);
pdfview.SetProgressiveRendering(false);
pdfview.SetRasterizerType(PDFRasterizer.Type.e_GDIPlus));
pdfview.SetOverprint(false);
Each of the options has some pros and cons when it comes to rendering
speed and quality and the optimal choice depends on the requirements
of the target application. Please let me know if any of this helps.
As an aside we are currently adding a number of optimizations that
will significantly boost rendering and viewing performance as part
of v.5.8.