[Updated] Fix Mavericks slow Quick Look in Finder
01Nov13
Turns out Apple didn’t mess it up.
The real reason is SMB file sharing. Just go to System Preferences -> Sharing -> Options… and disable Share files and folders using SMB and you’ll notice immediate boost in responsiveness! via http://forums.macrumors.com/showthread.php?t=1662449&page=3
Filed under: Fix, Tweaks | 5 Comments
Tags: Apple, fix, improvement, Mavericks, osx, Preview, Quick Look, Slow
Recent Comments
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Ranza Research 
My problem was solved by starting up in Safe Mode (Safe Boot)
I opened all the folders that were slow in finder. The first 2 or 3 of them were still slow. Then they started to open really fast. Did nothing more. Restarted my machine & then everything was great.
Starting up in Safe Mode
To start up into Safe Mode (to Safe Boot), follow these steps.
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key.
The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple logo and the progress indicator (looks like a spinning gear).
After the logo appears, you should see a progress bar during startup. This indicates that your computer is performing a directory check as part of Safe Mode.
To leave Safe Mode, restart your computer without holding any keys during startup.
Best wishes
worked for me
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