Here is a strange problem. I used iTextSharp PDFStamper to generate a PDF with FormFields. Everything works great.
Some users have complained that Acrobat Reader is taking a long time to open a PDF. I have confirmed this, the same document that takes me 1 second to open takes them 20 - 30 seconds. What could be the cause of this? I don't think it is any of their machine processes though, they can open other PDFs fine and I NEVER have this issue.