Calling all final cut pro experts. Frame Rate drop/lag when importing movies?

So it sounds simple. I took a movie with my new Nikon D3100 HD camera, imported it to Final Cut Pro, and for some reason it has bad frame rate drop and lag to the point where it almost freezes.

I have no idea how to tackle this… Codecs, movie formats, resolution, who knows?

Added (1). Kind: Quicktime Movie
Codec: H.264
Res: 1920X1080

Added (2). - Video plays back fine when played in quicktime.

- NVIDIA GeForce 9400M

Added (3). 4 GB DDR3, 2.4 GHZ

Hmm thats odd. Are you sure its not simply the processor in your computer being unable to handle the load of rendering HD video in an editing form with cut pro. Because I have used HD vid in Cut pro And Vegas 9 alot and never encountered a frame rate issue.

How much Ram does your computer have, and which computer do you have.
More often then not this is a symptom of not enough RAM. The Resolution is super large and will slow things down a ton with Photos if we're talking Movies and this high of resolution your computer needs a minimum of 4 gig of Ram 6 would be much better.