Why is preview slow

Yosemite 10.10.2 (14C109)
Preview Version 8.0 (859.7)
Preview, prior to yosemite, used to be a quick program that handled pdf's and images of all sizes.
my experience since updating to yosemite is that it is slower than it used to be and more prone to hanging up for unknown reasons.
It has become downright unusable with some files.
Drag and drop to add pages to files doesn't always work, both in/from the Finder & in the thumbnails in preview.
sometimes, pages won't print.
apple changed the way the edit tools work for no apparent reason and not necessarily for easier workflow.
i work with line drawing pdfs a lot and sometime i need to mark them up to send to consultants. waiting multiple seconds watching the spinning rainbow after each edit click is not the way to get anything done.
what happened?!?

Try a restart.
Do a backup, using either Time Machine or a cloning program, to ensure files/data can be recovered. Two backups are better than one.
Try setting up another admin user account to see if the same problem continues. If Back-to-My Mac is selected in System Preferences, the Guest account will not work. The intent is to see if it is specific to one account or a system wide problem. This account can be deleted later.
Isolating an issue by using another user account
Try booting into the Safe Mode using your normal account. Disconnect all peripherals except those needed for the test. Shut down the computer and then power it back up after waiting 10 seconds. Immediately after hearing the startup chime, hold down the shift key and continue to hold it until the gray Apple icon and a progress bar appear and again when you log in. The boot up is significantly slower than normal. This will reset some caches, forces a directory check, and disables all startup and login items, among other things. When you reboot normally, the initial reboot may be slower than normal. If the system operates normally, there may be 3rd party applications which are causing a problem. Try deleting/disabling the third party applications after a restart by using the application un-installer. For each disable/delete, you will need to restart if you don’t do them all at once.
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Am 09.05.2012 um 13:20 schrieb Shubhashri CG <[email protected]>:
Re: Why is CS6 slow, 64bit-mode or not?
created by Shubhashri CG in Fireworks - View the full discussion
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hey buddy, i should have given you "Correct Answer" there buddy.
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