Playback Quality Even Lower in FCP X?

For better or worse, I am currently using my MacBook Air 1.86GHz 2GB RAM on OSX 10.6.8 with Final Cut Pro X. I am working on a 40-45 minute film project that involves large quantities of AVCHD footage from my Canon HF 10 and I am utilizing a new 1TB Western Digital external hard drive (the model that is powered via the USB without a wall AC adapter).
Due to my set-up, playback in FCP X is choppy and that makes it difficult to work in FCP.
My two part question is this:
First, is there a way to lower my playback quality beyond just the two settings in the FCP X preferences for "Better Performance" and "High Quality"? Would this even help given the need for my files to travel via USB into FCP?
Second, is the problem unrelated to my settings for playback quality - would acquiring a USB external HDD with an AC adapter allow for better speeds and therefore smoother playback in FCP X?
What it all dials down to is: Is it the CPU and RAM on my MacBook Air that is causing choppy playback or is it the USB transfer and how can I improve playback?
I'd rather not have to export a .mov file every time I want to check whether my cuts are being made properly - playback in FCPX is dropping frames like there's no tomorrow.
Thanks in advance for the help!
-Jack

Hi Jack,
USB drives are definitely a bottleneck, whether bus powered or plugged into the wall. Editing AVCHD (e.g., h264) footage takes a lot of horsepower as well.
I'd advise you to transcode your footage to Prores (you can do this by selecting 'optimize media' either during import or afterwards in the event browser by choosing "Transcode media"). However, you might end up even having to use proxy media since the USB throughput still might not be enough. Proxy media is a lower resolution version using the prores proxy codec.
Try these out with just one or two short clips and see if that helps performance.
With regards to your second question, if you are using a 3.5" drive, I'd advise using AC power and not the bus. This isn't for performance reasons, it's more for hard drive safety reasons. A 2.5" drive usually doesn't need as much power, and is generally safe to be bus-powered (as long as you aren't using any other bus powered USB devices at the same time).
EDIT -- if at all possible, upgrade your RAM. I don't know if the Airs allow that though. That would definitely make a difference.

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