PDF in Preview id blurry on scrolling after upgrading to 10.9 I upgraded my system to 10.9 Mavericks. Preview works not as good as before. I have the same trouble with that post. What will the problem be? Lack of memory? New configurations of Preview? I hope to use it smoothly as before. What can I do with it?

I am using Macbook Air 2013.
It could be a caching bug in 10.9.0. If you have not transferred any files to this computer from a another Mac (via Time Machine for example) then you should be okay.

I doubt you have an actual hardware issue or limitation. If you were running a 2007 MacBook and you performed an upgrade I would expect this before due to the grandfathering of certain files/preferences/caches. 

In a fresh system and new model your issue would not be tolerated by Apple. I would suggest submitting some feedback to Apple: http://www.apple.com/feedback/ and get them aware of this issue.

If this starts to show up in other apps or with other file types then it might be a good idea to go to an Apple Store or AASP and let them do a check on it.