Preview working very poorly

Ugh.  Preview is driving me crazy.  Been this way for a while since upgrading to Mavericks (make that updating).  Cannot scroll through a PDF, and when I try and add notes on a post-it, the text on the screen is so slow that what appears is like 20 keystrokes behind what I am typing.
I'm looking at 10 to 20 MB PDFs, and need Preview to work for, well, work. Tried safe boot mode, repairing permissions, and more (I did notice that in user / library /  caches that I don't have any com.apple.preview folders, but not sure what this means).
This is driving me crazy…it seemingly doesn't get any more basic than looking at a PDF, and my machine has plenty of power…embarrassingly pulling my hair out frustrating.
Lots of looking online, and no magic bullet that I can find.

Please read this whole message before doing anything.
This procedure is a diagnostic test. It won’t solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this test is to determine whether the problem is localized to your user account. Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your documents or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this behavior; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault in OS X 10.7 or later, then you can’t enable the Guest account. The "Guest User" login created by "Find My Mac" is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.

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