1 hour to export 5-minute long video on iMovie?

i exported 5 minute long video in imovie using quicktime because according youtube, helps solve or prevent video/audio sync issues.

found takes longer exporting time, mentioned in title, took 1 hour.

seems problem here?

here settings chose:

compression: h.264
quality: high
frame rate: 25fps
encoding mode: multi-pass
dimensions: 720x576 (768x576)​

 

what imovie version run on exact mac mac os x version?

identify mac , mac os x version, visualised in more elaborate image
identify mac , mac os x version using 25 second video tutorial (3mb, .mp4, h.264)​

 

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