Why is the preview of my video montage so slow ?

Hey everyone !
I just begin to use Final Cut pro, i used to edit videos on Imovie.
I use videos taken from my gopro 720p 60fps, so i began my video montage and as soon as i begin to use a lot of very short shot, the preview is ultra slow !
By the way, the setting of the project are 1280x720 59,94fps.
What should i do to get a smooth preview ?
Thank you and sorry for my english i'm french.

Did you convert the GoPro files to the proper format prior to importing into FCP?
-DH

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