Personally, I would need to know a lot more about your machine before I could help you figure this out. Do you have your media on a separate hard drive from your operating system and applications? How much ram? Do you have just one 2-core processor?
Model Name: MacBook Pro
Model Identifier: MacBookPro7,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 4 GB
Bus Speed: 1.07 GHz
Boot ROM Version: MBP71.0039.B0B
SMC Version (system): 1.62f6
Sudden Motion Sensor:
Im using Seagate external hard drive
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External USB hard drives do not work well for video editing. If you are reading and writing simultaneously to an external USB, it's gonna create a tremendous bottleneck. I'm fairly sure this is your problem, as well as only having 2 cores and 4 gigs o' ram.
Thanks not using the USB knock off about and hour, i will be looking to getting i7 2500k in the future, i am new to this and thought i was doing the right thing by buying a Mac, guess not....
What I built to edit AVCHD - http://forums.adobe.com/thread/652694?tstart=0
When you switch to Windows and a new computer, at least 3 hard drives
My 3 hard drives are configured as... (WD = Western Digital)
1 - 320G WD Win7 64bit Pro and all program installs
2 - 320G WD Win7 swap file and video project files
3 - 1T WD all video files... input & output files
Search Microsoft to find out how to redirect your Windows swap file
No one ever does the right thing when they buy a Mac.