Delay on playback

Final Cut Pro 5.1.4 running on a brand new Mac Pro (10.5.4, 6 GB RAM, 2x2.8 quad CPUs).
When I hit "play" there is frequently (but not always) about a 5 second delay before playback starts. I haven't seen this problem yet when playing back Source-side material in the viewer.
All Media is stored on an internal 1 TB 3.0 GB/s SATA drive with perhaps 200 GB of material on it. (I.e., mostly empty). The sequence in question is very, very simple. (One video track, 6 audio tracks, no effects or dissolves whatsoever).
What's going on here? I used to use FCP on a G4 PowerMac about 8 years ago and it never had this kind of sluggishness. (Nor did my more recent G5 PowerMac).

Brian,
It is a pretty small project. (DV footage). No nested sequences, no graphics at all (haven't imported them yet). This is a 2 minute promotional film. There's perhaps 30 minutes of raw footage in the project.
I excluded the drive from Spotlight at your suggestion and haven't seen any improvement. I don't know if I would need to reboot the computer, etc., to see any effect there...
I'm actually starting to think it is something to do with some of the footage. I brought in an old project and wasn't seeing the problem in that project. With the current project, the client delivered some of the footage as a DVD, and I was forced to use Streamclip to rip the footage from the (non-commercial, unprotected) DVD into DV format. The rest of the footage digitized from a DV camera. I wonder if the Streamclip footage is weird in some way that's causing the difficulty? (I've never used footage obtained that way before).
Thanks for the ideas.

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