My FCP7 application is constantly lagging and freezing during playback.

I am working off of a 4TB external HD with nearly 2TB of free space. I am constantly getting no playback after about 30 seconds of uninterrupted playback, sometimes less. I have trashed my preference files and still have had no luck. This is bringing my workflow to a standstill and I am about to start missing deadlines. I need help ASAP. any suggestions?

do you have at least 20% free space on your startup drive?
Do you have multiple external drives connected? Try disconnecting everything but the media drive.
How is the g-tech drive connected? Firewire? Thunderbolt?
You might be having a drive problem. Run applications: disk utility: drive repair on all drives. You'll need to boot of your install disk or restore partition to run it on your startup drive. I'd also suggest getting and running DiskWarrior. It's saved my life a few times
http://alsoft.com/
You might do some googling and find a drive speed test application to see if there's an issue with the g-tech.
And here's a user tip with a bunch of troubleshooting steps
https://discussions.apple.com/docs/DOC-2591

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I have a MacBook Pro (Late 2011). Processor 2.7 GHz intel Core i7, memory 4GB.
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Once, I dropped my mac from the couch and there was a beeping noise like a siren. I turned off the computer, then turned it on and it was working fine. Everything worked fine for 3-4 days.
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MrShaneTV wrote:
I have tried everything I could think of from running CCleaner make sure.
Third party 'cleaning' apps should be avoided. They will not help and all to often with hurt performance.
I have booted in safe boot and it seems to operate just fine there with no lagging.
That is a sign that you have a third party application that is affecting your system. Essentially you have to remove all of them and reinstall them individually until you identify the culprit. Down load Etrecheck and post the result and we may be able to speed up the process if it shows a possible candidate:
http://www.etresoft.com/etrecheck
Look at the relevant sections of these links:
http://support.apple.com/kb/HT1564?viewlocale=en_US
https://discussions.apple.com/docs/DOC-3521
https://discussions.apple.com/docs/DOC-3353
Also, have you opened Disk Utility>First Aid and run Verify and Repair?
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My FCP7 application is constantly lagging and freezing during playback.

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