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Manual Chapter: Accelerating Access to PDF Content
Manual Chapter
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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 WebAccelerator™ system 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 WebAccelerator system 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 WebAccelerator system provides a linear PDF file, thus allowing expedient access to a requested page.

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