Adding Transitions freezes and stutters playback in Preview.

I'm posting this as a new issue. Since I've narrowed down my "stuttering/freezing on playback" problem while in Preview/Edit mode.
This begins to happen as SOON as I add a transition. Whether I add it automatically, or manually.
The clips play fine without transitions in the project and the Event window. These are clips from a Kodak Zi6, I believe shot HD at 60fps, and I'm using NTSC 30fps to create the project. When I "get info" on my clips, the codecs listed are H.264 and AAC, dimensions 1280x720.
When the Movie Project is exported & viewed in QuickTime, it plays smoothly.
Any ideas are greatly appreciated, as I'd like to preview my work as I go!
This movie is LESS than one minute long!

UPDATE - A workaround?
after what you posted about converting the file to the apple codec AIC - it occurred to me to try this.
Put a clip in the project browser - it starts stuttering - with or without transitions.
click on clip and select "clip adjustments". Now when you need to run slow mo you click the "convert clip" button. Do this even though you don't need to slomo the clip and it will come up with "converting whole clip" - this can take a while if the clip/event the clip is from is quite long. Hang in there. Click done. ......and......
all works perfectly.
It seems like the converter converts the whole event because if you now choose other clips from the event they too work with no problems! So looks like... before you start run the conversion on a clip from all the events you are about to use and then you can work normally...
I've run a test project and now transistions/ green screen/ PiP all work smooth. IS this the workaround we needed?
Do you know if the convertion to AiC changes size or quality? I cant tell at the moment. But it works! (well so far.....)
Please let me know if this works for you too - if so it might be worth starting another thread as so many people are having the stutter problem and i've not seen a workaround yet that's easy to do.
Anyone?
Apple - we should not need to do this!

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