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Curves Pane slow performance


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When opening the curves adjustment, the pane opens quickly, but the contents (the actual curve unique to the image) are slow to appear. Usually it's just a second or two, but it feels slower than in the previous version(s) of Affinity photo. On rare occasions, it has never filled in the actual curve, or I have given up waiting for it.

Affinity Photo 1.7.1

MacOS 10.14.5

2018 Mac mini 3.2 GHz Intel Core i7; Intel UHD Graphics 630

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Hey LinkLayer,

I'm waiting about 12 seconds before the histogram loads. I have seen another user report that he gave up after 20 minutes of waiting. 

We give the Histogram additional CPU power in the Develop Persona but in the Photo Persona, we don't. However I think 12 seconds is far too long to wait. I tried on another iMac and it was still around 6 seconds.

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