Freezing Going from Preview to Timeline

I am editing together a video that involves a bunch of narration files alongside HD animations (720p) and when I select either the timeline or the preview window to cut clips before taking to the timeline I get about 4 seconds of freezing before I can work again. It does not always do this so It really frustrating. I have no programs running besides premiere yet it does this. Anyone have this happen and know how to solve?
Here are my specs
8 Core Mac Pro 2.226Ghz
16GB Ram

You have given us a start, but more info would be greatly appreciated. This ARTICLE will give you an idea of the type of data that will help.
Unfortunately, all of my "tune up" tips for an NLE computer are for PC's, so they would be moot here - sorry.
Good luck, and hope that someone can get you up and editing smoothly,
Hunt

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Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins and log in as Guest. For instructions, launch the System Preferences application, select Help from the menu bar, and enter “Set up a guest account” (without the quotes) in the search box.
While logged in as Guest, you won’t have access to any of your personal files or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this; 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(s)?
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.
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Hey Guys,
Sorry for another thread being opened, but I guess the old thread is not to the point with my problem.
The current situation is simple, I can't edit avchd footage.
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Many thanks,
Eliran.

Hi Eliran,
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Jeff Pulera
Safe Harbor Computers

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Ah I understand. Well here's what I managed to HUNT down
This issue was posted on this very forum on April 15th which can be found HERE.
If you look at reply #3 you can see that member has the same computer I had (HP desktop with beats audio).
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Hello.
I have an experiment to be placed in the timeline, the audio of different sampling frequency.
However, when previewing the timeline, you will hear a noise.
48kHz based sequence + 48kHz footage = OK!
44.1kHz based sequence + 48kHz footage = NOISE!
I've created a sample project.
Will you try someone?
https://workspaces.acrobat.com/?d=a2ulIg2OrcCa-Fw1JKcyew

Addational info...
Premiere Pro CC v.7.2.2
OS: Windows7 Ultimate SP1 x64
Audio Device: HDMI LCD Monitor from Intel HD Graphics (Core i5-2500), with "Premiere Pro WDM Sound"

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Back up all data.
This procedure will unlock all your user files (not system files) and reset their ownership and access-control lists to the default. If you've set special values for those attributes on any of your files, they will be reverted. In that case, either stop here, or be prepared to recreate the settings if necessary. Do so only after verifying that those settings didn't cause the problem. If none of this is meaningful to you, you don't need to worry about it.
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Boot into Recovery by holding down the key combination command-R at startup. Release the keys when you see a gray screen with a spinning dial.
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resetpassword
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Freezing Going from Preview to Timeline

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