Why is PDF scrolling not always smooth and very slow?

With some of my adobe reader pdf's, when I scroll along, it goes super slow. Sometimes, when I stop scrolling, the document keeps moving for several seconds, so I then have to scroll back up to where I wanted to be. Why does this happen with some documents? Is there a way to fix it? Is there another reader that might help in those situations?
Aaron (first time asking a question on this or almost any forum) (email address removed by host)

Although "normally" using too much memory causes these types of problems, I currently have the latest and fully loaded machine (macbook pro retina with maxed out memory....), so I did not think that was the issue, although still a helpful suggestion.
However, I have solved the problem, for anyone interested. I searched several forum discussions on this website and saw a lot of references to using "preview" rather than adobe reader, to read my longer pdf's. I followed one suggestion, changing the settings to "change all" pdf's to be opened and read through preview. OMG, what a difference! It is perfect now, an amazing difference. So, I am happy, as my digital ebooks in pdf form are now actually readable.

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