I have noticed issues when converting large PDF (3.5MB and higher) that it freezes the system, and in the course of 5 minutes will create temp files over 10GB in size.
Let me know if you need any info
Comments: It will be probably be faster if you read the PDF file page by page. Otherwise it will need to put a lot of images into your memory. At some point it will swap to disk and give you terrible performance. There is an example on how to read an individual page here: https://magick.codeplex.com/wikipage?title=Convert%20PDF&referringTitle=Documentation. When you specify a page number that is larger than the number of pages an exception will be raised. You can use that to determine when to stop.
Let me know if you need any info
Comments: It will be probably be faster if you read the PDF file page by page. Otherwise it will need to put a lot of images into your memory. At some point it will swap to disk and give you terrible performance. There is an example on how to read an individual page here: https://magick.codeplex.com/wikipage?title=Convert%20PDF&referringTitle=Documentation. When you specify a page number that is larger than the number of pages an exception will be raised. You can use that to determine when to stop.