Lightroom Classic: Stops responding and is slow and unresponsive when using the adjustment brush

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Lightroom Classic CC stops responding and/or becomes impossibly slow when drawing masks and making adjustments with the brush tool.

I have a relatively new iMac with 32gb memory and Lightroom is optimised according to every bit of advice available on this forum and elsewhere. Despite this, on my system, the Adjustment Brush is effectively unusable.

I'm attaching a couple of screen recordings to illustrate the issues.
Video 1 Adjustment Brush Not Responding: The adjustments start at 0:12 and complete at 1:24 (1:12 seconds to complete). The Activity Monitor show Lightroom Not Responding at 1:03. That's over a minute to update one simple adjustment.

Video 2 Adjustment Brush Not Responding: The adjustments start at 0:08 and on average each takes around 30 seconds to update


Video 5 Adjustment Brush Slow Unresponsive: Mask adjustments are slow to update on the screen making the process of painting adjustments unusable. The actual adjustments lag behind up to 30 seconds. It takes almost 10 seconds just to hide the Mask Overlay (1:42 selected - off at 1:51).

Does anyone have any answers on how to improve my system or make this aspect of Lightroom functional?












































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Harvey Kaufmann

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Posted 4 weeks ago

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Rikk Flohr, Official Rep

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Harvey, 

If you go to Preferences>Performance> and uncheck the Use Graphics Processor option, does the speed improve?
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Harvey Kaufmann

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Hi Rikk, I replied last night but looks like a glitch in the system (perhaps I failed to hit the submit button) and it's not here now. So...

Yes, turning off the GPU is a big improvement. That's confounding because that option has provided very little improvement in the past. However, now I'm noticing slower page scrolling and spot removal processing and other various actions seem to be a little more sluggish in Develop. For example; the "visualisation" option (spot removal tool) can take 20-30 seconds to restore when switched off (that's improved over the previous state where it was taking up to a minute). I am also finding that screen updates during scrolling (with the hand tool zoomed 1:1) lags and can take upwards of 20 seconds to update when doing fine masking.

So, the issue has improved overall and I can work but it's far from satisfactory. 

I really love Lightroom and I'm early adopter having come across in the first days from the original rawshooter software. I'm frustrated, having just purchased a new iMac Retina with 32mb of memory and large SSD in the expectation that the investment would greatly improve my workflow and enjoyment of Lightroom.

But despite the hardware upgrade, over the past 18 months, the feature set has improved but the performance and hence the usability has dropped off massively.

The fact is that the program has been unusable at times for simple editing and I wouldn't even consider doing some of the detailed editing that I routinely now do in Luminar and ON1.

I already go to great lengths to squeeze the maximum performance from Lightroom; I restart my iMac often, I close every background process, make small catalogs; I pay strict attention to workflow order (which means I don't crop or do lens corrections until I finish editing, which is a really compromised process IMO). If I'm accumulating a large history I often clear it all and start again to reduce the system load (that's really time-consuming) and many other little things like turning off my virus software.

What can I do to get a better result with this program? Frankly I'm getting ready to change despite how much I will lose in the transition to a new platform.

Thanks for your help, regards,

Harvey Kaufmann
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Rikk Flohr, Official Rep

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Harvey, 

7.4 was released earlier today. I would be curious to see if your brush issues persist with GPU on in 7.4 or if you have to turn it off as you did in 7.3.1
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Harvey Kaufmann

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Rikk, It's a mixed bag with the new version. I've invested a few hours checking things out with the new version. Some issues seem to have improved but others have stayed the same or gotten worse depending on the GPU state (on/off). The brushing has definitely improved overall with or without the GPU but spot removal is now a problem all the time - the screen lags so far behind the mouse movement that it's a real problem just to select the item for removal.

It really depresses me to see all these You Tubes of Lightroom users doing these quick and amazing edits that simply can't be replicated on my system. So I guess my simple desire is to just use the program to express my art without all this complexity and compromise. It just constantly stresses me out, totally interferes with my workflow and creativity and provokes my interest in alternatives.

Slightly better off and hopeful, but still frustrated.

Regards,

Harvey
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Rikk Flohr, Official Rep

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Harvey  - what is your monitor resolution?
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Harvey Kaufmann

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Hi Rikk, it's the built-in Retina display: 27-inch (5120 x 2880), AMD Radeon R9 M395 2048 MB graphics with 32gb ram

Is there an issue with display resolution?

I've done some further testing with the adjustment brush which shows it to be very unresponsive with the GPU on and off. The show/hide selected mask option can take up to 1:20 to change it's state and brushing with low flow/density is just not a useable function. I've attached a video link to demonstrate.
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Harvey Kaufmann

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Hi Rikk, This was posted from Adobe engineers - should I just rollback to 7.2?

Hi All,

We're really sorry for all the trouble caused you. We have identified this issue as a bug and our engineering team investigating a fix. Please add your vote to the below feedback link.

Lightroom Classic 7.3: Slow switching from Library to develop, zooming in, using brushes | Photoshop Family Customer Com...

 For now, rolling back Lightroom to 7.2 version is the only workaround available.

Thanks,

Mohit
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Rikk Flohr, Official Rep

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Harvey, it wouldn't hurt to roll back and see if you have improved adjustment brush performance. Do you happen to have the link that you are quoting from above?
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Harvey Kaufmann

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Hi Rikk, I do have the link and have rolled back to 7.2. This is a vast improvement with some notable exceptions that I've noticed as I have been working; viewing an image in fullscreen can take up to 45 seconds;  the program seems to progressively slow down over time while editing (improved by a restart).
It seems like I get significantly better performance If I avoid auto-masking and the paint adjustment tool in favour of radial filters. But that's not a solution, it's a poor workaround. 
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Rikk Flohr, Official Rep

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with or without GPU enabled in Preferences?
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Harvey Kaufmann

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Hi Rikk, I get mixed results when the GPU is disabled. Overall using the GPU is better.

I'm still having significant issues when I do a lot of editing - the system slows, the rotating ball starts becoming more frequent. My current workaround is to convert to .tif and export to external apps; PS, Nik, Luminar, OnOne but that's definitely not my preference - really I just want to be a Lightroom guy. 

Any news on a new update that might help?

Cheers, Harvey
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Rikk Flohr, Official Rep

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Harvey,

If this were my machine, I would still be suspicious of the install - even though you've rolled back to 7.2 and forward again.  As for updates, I don't have wide-spread reports of this behavior so I would hesitate to tell you wait for the next update. 

As I said, if this were my machine, I would:

Restart computer.
Uninstall Lightroom 7.4 Classic CC using the Adobe Creative Cloud App
Restart computer again
Without opening any other programs, reinstall Lightroom Classic via the Adobe Creative Cloud App. 
Launch and then tet Lightroom sit for an hour or so before using.

This is probably overkill on caution but I am trying to eliminate as many variables as possible.  
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Harvey Kaufmann

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Hi Rikk, I've done what you recommend several times with completely mixed, but still unsatisfactory results. I've created and used a new library with only one image in it without seeing any improvement. I've also done every other thing that I can think of bar formatting my drive and reinstalling everything - but the issue is with Lightroom alone, nothing else on my computer is giving me the slightest problem - so I'm not convinced it would make any difference.

I've now run into a wall on a large pano image that I just can't finish in Lightroom - this one is a commission, so I'm at risk of losing a client. Not happy.

I'm attaching a clip that shows (on LR CC V7.3) a 30-second lag while (I guess) the smart preview loads up. I had just rebooted Lightroom after shutting down after waiting over a minute watching a spinning ball and then nearly a minute more for the screen image to reset itself from being blurred somehow during a brush adjustment. You can see the blur on the sides of this image in the clip and that it can take minutes to do the smallest adjustments. I can't experiment with adjustment faders to preview the effect because of the lag and long delays in rendering.  So essentially Lightroom as an image editing program is useless. That's core functionality that's not functioning!

Rikk, I need some real answer to these various performance issues. Is there a problem between Adobe and the new 5k Retina iMacs - is it the wrong platform for Lightroom? If, as you say, no-one else is having these types of performance issues (and I'm sure there are some significantly more serious Lightroom power users out there than me) then what's my problem? AND how does that reconcile with the admission from the Adobe engineers, that I referenced earlier, admitting that there were significant performance issues that forced the need to rollback to V7.2?

I haven't been able to work effectively for many months now. Instead of being creative, I'm investing massive amounts of time trying workarounds and reinstalling, configuring and recording clips of problems when I just want to work on my images.

I'm a long-term paid up, loyal Lightroom user and I'd appreciate some real, helpful, actual problem-solving support and answers. Even some information about things that are coming up that could help me would be encouraging. This issue (since I raised it in this forum) is over three weeks old already and apparently, it's going nowhere.

Help!

Regards Harvey
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Marty Friedel

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To chime in on this issue - I am on a 27" Retina iMac too, 32GB RAM, and SSD only, and have had such a mixed bag of performance with Lightroom, especially 7.4.

Sometimes it runs OK (but still not fast or snappy) but othertimes is just like Harvey.

Toggling Hardware Acceleration is a mixed bag too - sometimes on is better, sometimes off is better. I've been unable to find a consistent experience or set of circumstances where it goes good or bad. 

Even flicking from Develop to Library takes seconds.

I know the retina screens have so many more pixels to paint and display, but the performance is simply lacking, especially given the power of the hardware itself. It is almost like no testing is being performed on screens such as this (or the issues are being ignored).
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Harvey Kaufmann

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Rikk? Any help coming here? 

I've continued troubleshooting these problems without any progress so I've now taken the same images into OnOne and Affinity and been able to process them far more intensely and without the slightest issue.  

Since my last post, I have also discovered that file size appears to be a big part of the issue. LR 7.x copes reasonably well with files from my Fuji XE-2 and older files from my Canon 7D. Downsizing my D810 panos and other images to smaller .jpegs has enabled me to edit them with only very minor issues.

Lightroom is still my editor of choice but it needs to be functional and it's not at this point. Still waiting...
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Harvey,  I still don't have a feel for where things are stalling for you here but the investigation into large file size is a good clue. 

How large are these panos before you downsampled? Size in MB? Size in Pixels? At what size did you find they starter performing 'with only minor issues?