Optimize increases in file size by 5 times why?

Hi All,
This maybe a simple question but please hear me out. I take footage on my Go Pro HD 2 in 1080p. I have the files on a network storage device total filles size = 79GB. When I import to FCPX I run my events from a 1TB thunderbolt connect drive into my imac 27 inch for editing. If I optimize the modia on import to convert from MP4 (which edits fine in native in FCPX btw) to Apple ProRes 422 then the file size increases from 79GB to 379 GB which just seems ridiculous? I did have colour analyze also checked, but can someone let me know if this is normal? I wouldn't expect the ProRes to be 5 times the size of the original?
Thanks

Most modern consumer cameras shoot AVCHD or other very compressed footage.
This is fine for playback but the high compression puts a great strain on the processor during editing.
Turning it to ProRes 422 reduces the compression, so making it easier to edit but of course it greatly increases the file size.
When you have finished editing you can export the finished movie as AVCHD and once again it will be back to its original small size  .......  or even smaller.
You can of course try editing your native footage without optimising but you may get lots of dropped frames and stuttering playback etc. making the editing process tedious.
Try it and see  ........  you may be lucky if your computer is powerful enough.
You don't need colour analysis.
Message was edited by: Ian R. Brown

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