Lightroom stalls all the time - just about unusable.

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  • Problem
  • Updated 9 months ago
  • (Edited)
When doing just abut anything with larger numbers of photos LR slows down and becomes unresponsive to a point where I have to quit and restart it. An example might be reviewing photos from daily shoots that may have 700-1,000 images per drive folder, grouping stacks and doing some colour tagging. Within 5 minutes of this type of operation the responsiveness drops from around a second to 30 seconds of more, along with "LR not responding" messages from the system.

Examination with process explorer after more complex operations (e.g. settings paste) can show that there are huge backlogs of activity that draw CPU load even once I have stopped doing anything. These eventually die down if you wait. But even with simple operations like labeling and tagging, the delays rapidly escalate. And process explorer shows residual DPCs (Delayed Procedure Calls) that stall LR (when they are complete, LR responds again). A task labeled ÄgViewWind32Windows::'default constructor closure' seems always to be associated with this problem.

I have attached a link to a zip file with the LR info dump and some screen shots from process explorer showing the delaying task(s). The info dump will show you I have a system that is more than powerful enough. It was built specifically to provide a decent platform for LR. It is a super stable Windows 10 Pro x64 system with an overclocked 6 core CPU, 32GB of RAM, separate high performance SSD's for system and LR cache and a GTX980ti GPU. There are NO EXCUSES for LR not delivering stable performance. I have only around 190k images and the catalog is 3.3GB. With modern database technology - and the resources available - this should run like lightening.

It is getting to a point where LR is, frankly, unusable. I know I am not alone with this problem. When is this going to be fixed!!!!!?
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Rod Laird

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  • VERY frustrated

Posted 9 months ago

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Larry Fasnacht

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I have found that when this happens to me that closing LR and reopening it can make a big difference. Also rebooting works wonders for speed.
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Robert Frost

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Rod, I've got a fast computer like you and don't suffer these slowdowns that you seem to. Why? Well, I've used LR since it was invented and have learnt over the years to turn off everything that I can in LR so that it does not spend so much time on background processing. I see you have 21 plugins installed! Horrors! I rarely use plugins, so they are all usually disabled. I close Navigator, and filmstrip, turn off Sync and face recognition, make sure all previews are rendered, including 1:1s if I am going to be using them. GPU performance is turned OFF, since like you I don't use 4/5K monitors, and GPU performance may slow down things with smaller monitors. Sometimes I even turn the internet off so that it can't waste so much time phoning home! One can get obsessive about these things!

The only slowdown I experience is in rendering previews, particularly 1:1s. I often have to close and restart LR to get preview rendering back to a sensible speed. LIke you I've used Process Monitor to look behind the scenes, and I can see LR wasting seconds between each preview as time goes on, but I can't see why.


I hope LR7/CC2018 will speed things up for everyone, but since LR has become such a 'jack-of-all-trades' program these days, I wouldn't bet money on it!


Bob Frost

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Rod Laird

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Thanks Bob. I have gone this route in the past. but actually need the functionality. The plugins are not the problem; at least they did not affect my outcomes when disabled. It's all the stuff that mashes the database and cache that causes the problem.
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Robert Frost

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Forgot to say that I also block the acr-cache folder - no reading or writing to it after purging it.!


Bob F.

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Larry Fasnacht

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Indeed, I have also noticed that even having several tabs open in IE or Chrome can slow Lightroom down.  When I am working on a large edit I close all programs except my email client, which doesn't seem to affect Lightroom.  

Also the Histogram slows things down.

I haven't noticed slow downs with plugins either.  
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Beverly Parks

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I'm a "tab-aholic" and, like Larry, have suspected a relationship between many open tabs and Lightroom performance.  Don't have anything to prove it, though.

Also, using lots of brushes or having lots of spot corrections on an image will bring Lr speed to a snail's pace.