I have mid 2017 27-inch 5K iMac with i5 9600K, 2 TB Fusion, 24 GB RAM and R580. While working with masks in Luminar it is tremendously slow and the changes are shown with delay of few seconds. This makes my workflow unnecessary long. In Photoshop, there are no problems while using layer masks there. Maybe the next update should be focused more on much more snappy performance.
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