Lightroom: Image export is much faster after restart - CC 2016.6.1 and before

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  • Updated 2 years ago
  • (Edited)
very simple to replicate, work with lightroom for a while them do an export for a bunch of images, you will notice the CPU will rarely go to 100%. Now restart lightroom and do the same export it will shoot up to 100% an will stay there until the the export is finished. You will also notice the export will be much faster for the same bunch of images.

I have been noticing it for a very long time probably since the beginning o CC 2016.

see CPU Graph below during export after lightroom restarted. lightroom finished exporting in less then a 60 second and all CPUs was maxed out to 100% since the start of the export.


This CPU Graph during export of the same bunch of images after working in lightroom for about 10 minutes. For one the export took double the time (hence you don't see the start of the graph) and the CPUs were utilised between 30-60% and rarely going to 100%.


I bet if you fixed that you will find other areas of the software will get faster as I suspect the slowness in export is a result of other performance issues.

good luck and keep on making lightroom the fastest raw processing software out there.
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Assaf Frank

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  • Optimistic

Posted 2 years ago

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Chaim Meiersdorf

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I found exactly the same thing. When LR seems to slow down not only do I restart LR I reboot the entire computer. The few minutes it takes to reboot are more that made up with the increased speed in the develop mode. 
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Assaf Frank

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I found this as well, I minimise or restart lightroom and reboot from time to time to get lightroom back to speed. Although reboot doesn't make sense unless it is the adobe CC that is related to the slowness I would think but I might be wrong. maybe we can try killing all the adobe processes instead of the reboot to see if this improves the performance to get closer to the problem.
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Assaf Frank

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Logoff has the same performance effect as reboot, will save you some time.
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Chaim Meiersdorf

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I would like to get other reactions to this simple suggestion. 
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Stefan Redel

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Nope, can't copy that behaviour on LR CC 2015.6.1 and fresh started Windows. Unfortunately.
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Assaf Frank

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I have done it again and I defiantly get performance improvement after a restart of lightroom. Also I tested it with big Panos 220MP and small files 22MB and I get the same behaviour CPU reaches 100% and stays there after restart and export was about 25% faster. Also the export is getting slower after 5 minutes or so and then I stop it and continue it again after restart and its fast again.

I also noticed the memory keeps climbing to 30GB while the export getting slower but this is with the big panos export only and with small files of 22MP memory keeps steady and not keep climbing.

my files are phase one IQ280 so it might be with the type of files although I doubt it.
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chaim meiersdorf

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Would the same issue take place if you were using another processor like capture one?
(Edited)
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Assaf Frank

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No. capture one is bullet proof. The export there is totally 100% CPU all the time they know how to use the CPUs very well.
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Assaf Frank

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Hi Stefan, I suspect this performance issue is linked CPUs with 6 or more cores that are older than your latest i7-6900K. see those treads.
https://forums.adobe.com/thread/2210245
https://feedback.photoshop.com/photoshop_family/topics/lightroom-clone-and-brush-tool-can-not-stress...
(Edited)