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He is using Sony software on the iMac and Apple's own iMovie on iPhone. iMovie for macOS and iOS has always been ridiculously fast, even on a 2011 MacBook Air.

Perhaps, a better comparison would be to compare iMovie on iMac VS iMovie on iPhone 12.

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That’s one step closer, but it all depends on what exactly you want to test and compare. If you want to test raw speed you probably need to use comparable transcoders.

Looks like Final Cut to me, which is Apple's software.

My bad. He said "Sony fx9 footage" and I mistook it for being the software.

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