I am testing PdfiumViewer to send pdf to printer in C#.
References:
https://github.com/pvginkel/PdfiumViewer
How can I send a file document to the printer and have it print?

I found that it’s slow when I send pdf containing many pages.
For example, if I send a pdf with 50 pages, it can take 40 seconds to send all the pages to printer queue.

How can the performance be improved?
Your advice is highly appreciated.