This is how much time it takes to Compress a PDF, from the time it's opening to the moment it's closed. Note about the above data. If you're using a high-performance CPU, the difference will be even more drastic. However, if you're going to do a quick calculation for a quick answer, then yes, it's worth it. The important thing to notice about this, is that if you want to get the best out of your documents and do NOT want to use a file browser and download PDFs, then you have to turn to Compressing a PDF on Mac, and it's free. You simply have to install the Mac version of Acrobat Reader, and it will convert your files for you. Download Acrobat at no cost. Download Why Compress PDF Files? Acrobat has been around for many years, and it's been getting better and better, but at present it's still not perfect at compressing PDF pages. Therefore, here are some simple reasons why you should think to compression your PDF documents. 1. Size — A single PDF file can now exceed 2 GB in size. For example, if you had an e-book on Apple's Pages book format that were 7.2, they could have reached 3.8 GB in size. You can think of it as the same thing, when there is a possibility of one PDF file having hundreds of pages. For example, a couple of days ago, a book had hundreds of PDFs, and one of them contained 50 pages. It would have been a nightmare to transfer the entire contents. Imagine downloading 50 separate PDFs, and loading them one at time. It would not be good to say that you're not going to store this document on your computer and print it yourself. 2. Speed — It is not a fast process. Depending on the file type, you will encounter an initial wait. Some pages will fail to convert, while others, are converted, and then loaded. You are not going to wait for a PDF to decompress. 3. Convenience — This will help you save time. When you need to use a PDF, you will simply drop it into your open document editor. Just click once on the 'Open With' menu, choose the document you want to use.