Are there file size restrictions when utilizing the time lapse feature in iMovie?

I am attempting to compile several hours (10 to be exact) worth of video footage from a Go-Pro that I would like to condense into one time lapsed video using iMovie. After modifying the speed for the clips (31 total individual clips) my computer is unable to play back. I end up "beach balling" and waiting for the processed clip to load for an undetermined amount of time --so far only resulting in the program 'not responding', pressuring me to have to force quit iMovie altogether. (The icon on the clip itself updates to depict the 'fast forward' rabbit, and the physical clip size does shrink to lead me to believe that the time lapse successful applied). If the clip does play to begin with, it is very quickly
Any advice on how to achieve hours worth of video footage without using other programs? I've tried speeding each individual clip with time lapse one by one, but adding even two of the 20 minute clips crashes the program.
any assistance or advice is extremely appreciated.
Hardware/Software:
Aug 2014 MacBook Pro, with OS X 10.9.4, iMovie version: 10.0.3

Try VLC Media Player. It has a reputation for playing just about anything you throw at it.

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Are there file size restrictions when utilizing the time lapse feature in iMovie?

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