You should use either compressor or mpeg streamclip (which is faster) to convert your footage to Apple Pro Res 422 and then import into FCP.
This will change your frame rate and file size to be much more manageable.
Here are two helpful tutorials:
Converting the footage:
https://www.vimeo.com/1829823
Your FCP project settings:
https://brucesharpe.blogspot.com/2009/06/dslr-dual-system-audio-999-solution.html
Hope this helps!
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