IMovie clips freezing/stuttering while editing in playback & after exporting to Quicktime

I've been working with iMovie since 2003 and if its not one thing, its always another. This particular problem is a new one, and I can't seem to find the get around. Any advice would be appreciated!
Working on a wedding video (large event size but only 6-8 minute project) and the clips are freezing/stuttering in the project and viewer windows when I try to play them back. Each time it freezes, I get the spinning wheel for 5-10 seconds before I can place my marker and try again. Endless cycle. This happened in a few other projects, but those I was able to edit out the freezing clips OR found that exporting to Quicktime seemed to smooth out the glitches, just made editing a pain.
Not this time. Even after exporting to Quicktime, there are still numerous glitches in my quicktime movies (using default and numerous other settings).
Here are the things I've tried: reinstalling my iLife 09 software, running all the updates, clearing off my hard drive (to give me 70+GB of space), detaching my external hard drive and only using internal memory, restarting, and deleting the plists. No luck, still have these glitches.
Could this be an issue with audio or using the stabilization option (used that for the first time)?

jepartyservice wrote:
.. 90min movie .. share to iDVD .. iMovie would freeze and be unresponsive.. .exporting to QuickTime .. 13 hours .. random stills .. iMovie will freeze ..
Would putting all of the clips and the project on an external hard drive help? Would updating to OS 10.5.8 help exporting to QuickTime?
plus your profile, MacBook, indicates to me, your internal harddrive is full.
check with DiskUtility, how many partitions your internal drive has.
check, how much free disk space internal you offer your apps.
imho, extHDD is a MUST when editing video..
.. is there any way to move our already edited clips from iM09 to iM06?
use 'Export using Quicktime', choose dv-stream (for SD content) or AppleIntermediate (for HD content) - these are the only codecs, iMHD6 reads..
this export consolidate the project => it comes into iMHD6 as a single solid file, e.g. no more editing of titles, which are now 'burned into film'.
_consider to create a special 'transfer'-version of your project:_
in Project Browser, select project, ctrl-click, 'duplicate', and create a pre-production version (no titles, no music, additional material for further editing, longer clips to add transitions in iMHD6.. ect)

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