Manual Chapter : Accelerating Access to PDF Content

Applies To:

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  • 14.1.3, 14.1.2, 14.1.0, 14.0.1, 14.0.0, 13.1.5, 13.1.4, 13.1.3, 13.1.1, 13.1.0, 13.0.1, 13.0.0
Manual Chapter

Overview: Accelerating access to PDF content with PDF linearization

Large PDF files can provide a slow response in displaying content when the entire file must download before a requested page can be accessed. The BIG-IP® device provides the ability to display a requested page more quickly by using PDF linearization (optimization). PDF linearization prepares the PDF file for byte serving, which enables the BIG-IP device to provide individual pages to a client when it receives byte-range requests.

All PDF files are constructed in one of two formats:

  • Nonlinear. A nonlinear (not optimized) PDF file typically provides slower access to specific pages than a linear PDF file because a page-offset index for the document's pages is omitted. For example, PDF files that are created for high quality print output are often nonlinear.
  • Linear. A linear (optimized) PDF file, in comparison, provides faster access to specific pages because a page-offset index for the document's pages is written at the beginning, enabling a web browser to send byte-range requests to access and display initial or specific pages before the entire file is downloaded.

When you enable PDF linearization, the BIG-IP device provides a linear PDF file, thus allowing expedient access to a requested page.