LR Classic: Detail panel affects Develop performance even when it's disabled.

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  • Updated 3 months ago
Hello, I would like to highlight this issue. Basically disabling Detail panel (ironically) or applying any non standard noise reduction makes Develop sluggish. Applies to LR6/7. Here is a copy/paste from my earlier post where I describe it in detail:

I have my sharpening and noise reduction defaults set up specific to camera ISO. During editing I have Detail panel turned off in order to speed up rendering a bit. Now I have found out that this is most probably the reason for sluggish Develop performance and the zooming delays. See here: https://feedback.photoshop.com/photoshop_family/topics/lightroom-classic-cc-develop-module-still-slo...
 
I hope I'm not completely off the mark on this but here is what happens:
 When you have any non default value set (it can be lower, doesn't matter) especially for Luminance or Color noise reduction in advance, delays going from one image to another start to appear. The effect is noticable. LR somehow includes NR values in its calculations but even if the panel itself is turned off! 

But there is something even more confusing here. It seems that even if you have the default values for NR (0 for Lum. and 25 for Chroma) and just turn Detail panel off, rendering gets slow again.
In the end you get the best performance with the default NR values. Disabling Detail panel has no speed benefits and it's even slower.

The way I see it, the resolution to this would be to ignore NR and sharpening values completely while calculating the auto values/rendering when the Detail panel is off. It would be logical. Now it seems it's not the case. Might be a bug even. This is effectively another source of  Develop slowness because it adds up to the initial raw rendering.  Anyone can try it (set any non default NR or disable Detail panel and go forward, zoom, drag the zoomed image, also Auto button is now active slower, etc.) 

If anyone from Adobe reads this, it would be interesting to hear from you, maybe Simon Chen ? :). 
Thank you.
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Alan Novak

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Posted 3 months ago

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Simon Chen, Principal Computer Scientist

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Thanks for the report. I'll do some experiments to confirm.
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Alan Novak

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Thank you Simon Chen. Great to hear. It seems like the default Detail panels values are kind of "hardwired" and any change in them (even on/off state) affects LR calculations somehow.

I can do further testing if needed, just let me know.
(Edited)