And it is unlikely that you will see significant if any size reduction in a file that is totally vector and/or text-based.
#REDUCE PDF SIZE ADOBE ACROBAT DC PDF#
An original PDF file with significant high resolution raster graphics will yield more size reduction than a similar PDF file with low resolution, low quality raster graphics. (1) The contents of the original PDF file.
The results of either Reduced Size PDF and Optimized PDF in terms of resultant file size depend upon: This feature is actually a headless version of File=>Save As Other=>Optimized PDF in which downsampling and similar settings are set to values that hopefully won't ruin quality too much. That option still exists in Acrobat DC!! You choose File=>Save As Other=>Reduced Size PDF. (Settings are available in Acrobat for these parameters!) In each case, you risk reducing the quality of what you see either on screen or print to the point where it is unacceptable due to lack of image resolution (typically yielding fuzzy-wuzziness) and/or compression artifacts. In terms of raster images, size reductions come at the cost of either reducing the images' resolutions, applying lossier compression, or both of these techniques. In terms of any text and vector content in the PDF file, the only significant size reductions that you can effect are associated with compressing the object streams, a feature of PDF 1.5 or later (if you need PDF 1.4 or earlier, this optimization isn't available). The size of a PDF file depends on (1) the type and amount of content on the pages and (2) the degree to which you wish to degrade quality of the content of those pages. Simply stated, you cannot legislate the size of a PDF file.
There is not necessarily a “significant problem with Acrobat” but perhaps a problem with either your settings for reducing files size or even your expectations.
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