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What does “suboptimal compression” mean when working with PDF CHECKERChecker?

A data stream in a PDF document can hold text, an image, or an object, with instructions on how the content will be rendered on the page. Data streams in a document can be compressed to make the PDF smaller and more portable. PDF CHECKER Checker looks for data streams in the input document that are not compressed, or that are using a simple algorithm that is not as efficient in compression, such as ASCII, or Run Length, or LZW.