When I'm editing a video on imovie, it opens with some black parts which are waging. How do I stop it?

My imovie is with problem. When I'm editing a video, it opens with some black parts which are waging, then the macbook gets slow. The original clip of the event gets all in blue and when I close imovie, it remains loading and lock completely.

i Founfd this exact behaviour with 1080p mivies on my machine. I redownloaded as 720p and all was fine. I think my computer is getting a little dated.
If this is true for you then Select Preferences, Store and When downloading High Definition videos, prefer and select 720p. Then red donload form the Purchased link under Quick Links in iTunes Store

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