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# This is what processing a stack of 720 light frames looks like on an iMac Pro
- URL: https://macobservatory.com/imac-pro-720-frames-processing/
- Published: 2018-05-08T23:46:38.000Z
- Updated: 2026-03-10T15:27:39.000Z
- Author: Andrew Burwell
- Tags: Imaging, #apple-silicon

1,000% CPU utilization in Astro Pixel Processor. I'm three hours into processing this stack of 720 luminance images for M101\. It's currently 29% in writing the light stacked image. So I anticipate about 4 hours total to stack this set. Interestingly CPU utilization isn't maxed. This[iMac Pro](https://amzn.to/2tVML8A?ref=macobservatory.com)has 32GB RAM, and 8 cores clocked at 3.2 GHz.

![](https://storage.ghost.io/c/8d/3a/8d3ae6c9-185e-49c7-b8a6-36d44545d9f9/content/images/2026/03/screen-shot-2018-05-08-at-6-43-50-pm-format-original.webp)