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Since a while, when I'm in Develop and switch to before view (with \ key), this will take several seconds. Same when switching back. I recall this being much faster before.
I have an Apple iMac 2017 5K, with a 3.8 GHz Quad-Core Intel Core i5 and 40GB RAM.
I am running Lightroom on my internal SSD (catalog and photo's)
I have set the camera RAW cache to 60GB or something
GPU is enabled (custom setting)
I have optimized my catalog
Regular edit are running fine as far as I can tell, it is the before/after view that slowed down.
Am I overlooking something?
Well, I ended up re-importing the photos as this was the only thing that solved the problem.
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Since a while, when I'm in Develop and switch to before view (with \ key), this will take several seconds. Same when switching back. I recall this being much faster before.
I have an Apple iMac 2017 5K, with a 3.8 GHz Quad-Core Intel Core i5 and 40GB RAM.
I am running Lightroom on my internal SSD (catalog and photo's)
I have set the camera RAW cache to 60GB or something
GPU is enabled (custom setting)
I have optimized my catalog
Regular edit are running fine as far as I can tell, it is the before/after view that slowed down.
Am I overlooking something?
Well, I ended up re-importing the photos as this was the only thing that solved the problem.
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Please try switch off the GPU support from the Lightroom preferences and check if that helps to fix the issue
Go to Lightroom > Preferences > Performance tab > Uncheck "Use Graphics Processor" > Restart Lightroom.
Adobe Lightroom GPU Troubleshooting and FAQ
https://helpx.adobe.com/lightroom-classic/kb/troubleshoot-gpu.html
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Switching off GPU support does not make much difference.
The strange thing is, I can do some edits (for example reducing highlight value and adding clarity) and switching between before/after is fast. If I do one extra edit (for example crop), switching between before/after becomes slow. And it remains slow, even if I undo the crop.
I am very sure, that switching between before after was always fast some time ago.
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It is getting stranger. I noticed that before/after switching was still quick on photos I edited a few months ago.
I also noticed that my default RAW settings (or develop settings) were different. For example, the default value for sharpening was higher (40) than before (25). So I made a new set for RAW defaults and imported an already imported photo again with a different filename. I applied the same changes and to my surprise switching between before/after is quick again. When I go the the other (duplicate) photo before/after is still slow (with beachball).
So how do I go from here? Do I have to re-import my last set of photos to solve the problem? (I am not enthousiatsic about that as I already edited photos). Or is there a better solution?
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Look at the History oif edits for the image/images that are slow. Is there any Adjustment Brushing going on?
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No, no adjustment brush. Just some straightforward edits like clarity, brightness, saturation, shadows and occassional cropping.
All my edited images from the last import are slow when switching between before/after. I checked images I edited last year, and all of these are fast (even those with adjustment brush).
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Well, I ended up re-importing the photos as this was the only thing that solved the problem.