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More about 2019 Mac Pro vs iMac 5K vs iMac Pro...
2017 iMac Pro: Iridient Developer
Related: 2013 Mac Pro, 2017 iMac 5K, 2017 iMac Pro, 4K and 5K displays, computer display, iMac, iMac 5K, iMac Pro, Mac Pro, Macs, storage, Thunderbolt, Thunderbolt 3
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Iridient Developer is a fast raw converter with good support for many raw file formats.
Iridient Developer — Export 352 JPEG
The 2017 iMac 5K takes 41% longer.
Results below with macOS 10.13.3 including the Apple Supplementary Update. See the results from more systems with macOS 10.12.2 further below.
Below, the results show that fast CPU as in the 2017 iMac 5K can work wonders—it competes very favorably considering that it has only 4 CPU cores!
The iMac Pro 10 is effectively no faster than the 8-core 3.3 GHz 2013 Mac Pro—suprising, but there it is. It might be that the algorithms used could be improved. But mainly, some of the files (Nikon D850 and Fujifilm GFX and Canon 5Ds R) use lossless compression and before any raw processing occurs, the file has to be decompressed, and that is a single threaded operation.
Recommended Items for iMac Pro and iMac 5K
See the recommendations page for details on why these items are recommended.