P: High CPU usage makes it unusable during export

Report · Oct 31, 2017

After latest Lightroom Classic CC I almost can't work in Lightroom during export as it's using around 90% off mu CPU. Maybe exporting itself is a bit faster but when exporting 2000 pics I'm unable to work for about half an hour as there are huge lags. In the end I would rather prefer slower export working in a background and still have ability to work with pics without such noticable slow down. It was much better balanced before updating to Classic CC.
My CPU: Intel Core i7-6700K (4 cores, od 4.00 GHz do 4.20 GHz, 8 MB cache)

Report · Apr 10, 2020

1. recommend that you turn RAPID mode for this drive
2. do other operations just slow down a bit or does the machine become unusable? Slowdown to be expected as resources are being shared but should not become unusable.

Report · Apr 10, 2020

Thanks for the rapid mode tip. I have read an article showing that ssd's only give a very minimal performance boost when exporting in Lightroom, even when compared to slow platter drives. Would rapid mode really make much of a difference? Exporting seems to be primarily a cpu intensive task.

https://www.pugetsystems.com/labs/art...

In response to your second question, everything slows down and the cpu is at 100%

Report · Apr 10, 2020

"Exporting seems to be primarily a cpu intensive task."

Indeed. I just did a quickie timing and my Macbook Pro exports a large batch of raws to the internal SSD at a rate of about 1 per second, with each exported JPEG averaging 8 MB. So that's 8 MB per second written to the disk, an order of magnitude less than spinning disks (even cheap ones) are capable of.

Report · Apr 15, 2020

When you are working live tethered in an event and need to export almost live while still capturing and with the client breathing on your neck, wanting both his exports and selecting the live shots, this is unusable and the client laughs at Lightroom or how you have a slow laptop even though you have a 4000$ machine to try and minimize that issue. It is a bug for that use case.

Report · Jul 05, 2020

I've been measuring and it seems that the problem is solved in the latest LR updates.

PC, con CPU: Intel Core i5 6600K a 350 Ghz, RAM: 32 GB, GPU Intel HD Grafic 530 y Windows 10 Pro

C: Samsung ssd 970 evo plus 500gb (operating system and programs)

D: Kingston HyperX Fury SSD 240gb (develop Ligthroom).

E: Western digital blue wd5000aakx 500gb (My documents)

F: Western digital blue wd5000aakx 500gb (Retouching Photoshop)

G: Western digital Green wd10earx 1000gb (Finished photo)

It is true that the CPU is at or near 100% when exporting from the Lightroom.

But it automatically drops the % if I'm using other applications:

Yesterday I measured the export of 1305 ORF (Olympus raw OM-D E-M1 ) to Tif (91 MB) and the time was 41 minutes, while I was stacking with the Zerene Stacker and cleaning with the touch-up brush in Photoshop, no problem.

Report · Jul 05, 2020

Ran a test on my system just for grins.

1304 EM1 raw files
tried 1305 but one file was corrupt and
didn't see the need to rerun for just
one file
No concurrent tasks
Xeon 6-core 36/40 GHZ

==== TIFF test ====

Image Format: TIFF
Compression: None
Color Space: Adobe RGB
Bit Depth: 16 bits/component
Resize: unchecked
Sharpen: unchecked
Include: All Metadata
Watermark: unchecked

12 threads driven with about the same load per thread
CPU 77-85%
Memory 6.01-6.08 GB
Disk 108-127 MB/s
GPU 0%

Duration: 22:05
Exported Size: 108 GB

==== JPEG test ====

Image Format: JPEG
Quality: 100%
Color Space: sRGB
Resize to Fit: Dimensions
Don't Enlarge: checked
3840x2160
240 pixels per inch
Sharpen: Screen
Amount: Standard
Include: All Metadata
Watermark: unchecked

12 threads driven with about the same load per thread
CPU 74-86%
Memory 7.4 GB
Disk 16-26 MB/s
GPU 0%

Duration: 24:58
Exported Size: 7.63 GB

Report · Jul 06, 2020

Appreciate the testing guys, but I'm still experiencing the same slow downs.

For example I just exported a few PSDs from RAW files and not only was Lightroom unusable, my music playing in a Chrome tab was cutting out.

Please look at this Adobe, I use Lightroom A LOT and it is not only painful but also makes me less productive.

Report · Jul 06, 2020

Absolutely agree that Adobe should fix this. While waiting for a fix, if you're on Windows you might consider this workaround:
https://feedback.photoshop.com/photoshop_family/topics/classic-cc-uses-90-cpu-during-export?topic-re...

Report · Jul 06, 2020

Hi John, I've tried your batch file with updated paths but nothing runs. I'm on a i7 machine, what would be the hexidecimal mask to use?

Report · Jul 06, 2020

Hmm, that .bat no longer works with LR for some obscure reason. I've updated the post to include an alternative that works on my Windows 10 / LR 9.3:
https://feedback.photoshop.com/photoshop_family/topics/classic-cc-uses-90-cpu-during-export?topic-re...

Report · Jul 06, 2020

Also, you'll need to find out how many virtual processors your i7 has. Go to Task Manager, click on the Performance tab, and look at the bottom for "Virtual processors". I suggest changing the .bat file to use 3/4 of the number of total virtual processors. So if you have 8 total processors, change the file to use 6 processors by replacing "7" with "63"; if you have 12 total processors, replace "7" with "511"; etc.

Report · Jul 06, 2020

Thanks John, can confirm this is working for me. Computer is definitely more usable but as I expected it doesn't help with my main issue - Lightroom itself is still unusable during exports.

Report · Jul 14, 2020

Exporting and publishing from Lightroom Classic 9.3 on my iMac (27" 5k 2017, 64gb RAM, OSX 10.15.5) renders the machine unusable.. CPU% has gone over 800% !!! ter is t
he computer inisorkeytokesn.

Right, I'll try again. When I'm exporting rom LR Classic 9.3, the CPU usage is going through the roof - so much that I can't even type - the keyboard doesn't recognise half of the keystrokes because the system is running so slowly.. it's awful. It's been getting slow the last couple of versions.. I've just had to install CPU Setter to limit the process in order to be able to edit this post.

It's averaging 500-600% CPU resources, but has peaked at over 800%...

Report · Feb 21, 2021

I have the same cursor lag problem while exporting, but it does lag only if i'm into the lightroom app itself; if i go into chrome, while still exporting ofc, no mouse lag at all. This is kind of interesting.. what you guys think?

Report · Feb 21, 2021

Hi Frank, yes Lightroom seems to lower resource usage when another app is focused. Which is great if you want to do other things, but good luck using Lightroom when exporting.

Adobe, any update on the ability to manage CPU usage for exporting? Or at least an export queue like capture one?

One thing I have done recently that is helping: When doing final exports for a project, change your export preset so it does not automatically import the files back into Lightroom. The import process seems to take a lot of resources and is even slower than the export process. I manage the exported files with explorer (or finder for mac users). Both are quite adept at working with the types of files we export from Lightroom.

Report · Feb 06, 2022

During operations such as Photo Merge and Export, I see Lightroom eat 100% CPU and stomp on other running processes. I saw there was an old thread about this issue, but that looks like it's closed due to the forum migration, and I'm still seeing this problem.

https://feedback-readonly.photoshop.com/conversations/lightroom-classic/lightroom-classic-high-cpu-u...

I'm on Build [202112022200-7fd1f998] running Windows 10 on a i7-9700K with 64GB of RAM.

Easiest way to notice is to have music or something playing through Youtube in the background, and it will cut and stutter during these activities as CPU runs out of headroom to decode the audio/video.

Ideal result would be Lightroom consuming maximum CPU possible without stomping on other processes to the extent of disrupting their functionality.

Report · Feb 06, 2022

So does Photo Merge work despite the CPU report?

Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"

Report · Feb 06, 2022

Please post your System Information as Lightroom Classic (LrC) reports it. In LrC click on Help, then System Info, then Copy. Paste that information into a reply. Please present all information from first line down to and including Plug-in Info. Info after Plug-in info can be cut as that is just so much dead space to us non-Techs.

Report · Feb 06, 2022

Ideal result would be Lightroom consuming maximum CPU possible without stomping on other processes to the extent of disrupting their functionality.

The easy workaround to do exactly that is to use the Windows Task Manager to lower the priority on LrC to "below normal". During the normal user interactions, you will see no difference since there is normally the CPU usage of the system is well under 100%. During the high CPU times, LrC will consume all the CPU time not used by other apps while allowing them to run normally.

Report · Feb 07, 2022

Usually, LR uses about 85 - 90% of total CPU for intensive operations like exporting, leaving enough CPU for interactive use. But as you've seen and experienced, there have been a fair number of reports over the years of LR using 100% CPU.

Given that this problem hasn't been addressed in the five years since it was first reported, I recommend that you consider workarounds. You could create a .bat script containing this line to start LR at low process priority, as suggested by @ManiacJoe:

start "Lightroom" /low "c:\Program Files\Adobe\Adobe Lightroom Classic\Lightroom.exe"

I recall some reports that this didn't help that much. If it doesn't work well for you, then instead of changing priority, restrict LR to use at most 6 of your 8 processor cores:

start "Lightroom" /affinity 3f "c:\Program Files\Adobe\Adobe Lightroom Classic\Lightroom.exe"

This ensures there will always be 2 cores available for non-LR tasks.

Report · Feb 07, 2022

Moderators, @Rikk Flohr: Photography, please merge with the existing bug:

https://community.adobe.com/t5/lightroom-classic-bugs/p-high-cpu-usage-makes-it-unusable-during-expo...

Report · Feb 07, 2022

Yes, Photo Merge, Import, Export, etc all work. They just noticeably stomp on other processes. I appreciate the community help in finding workarounds as well, but figured it was worth adding my experience to the list in case we can ever get Adobe's attention on this issue.

Lightroom Classic version: 11.1 [ 202112022200-7fd1f998 ]
License: Creative Cloud
Language setting: en
Operating system: Windows 10 - Business Edition
Version: 10.0.19044
Application architecture: x64
System architecture: x64
Logical processor count: 8
Processor speed: 3.6GHz
SqLite Version: 3.36.0
Built-in memory: 65454.8 MB
Real memory available to Lightroom: 65454.8 MB
Real memory used by Lightroom: 6389.4 MB (9.7%)
Virtual memory used by Lightroom: 27665.1 MB
GDI objects count: 1109
USER objects count: 2878
Process handles count: 3477
Memory cache size: 15673.3MB
Internal Camera Raw version: 14.1 [ 993 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 10297MB / 32727MB (31%)
Camera Raw real memory: 10373MB / 65454MB (15%)
System DPI setting: 96 DPI
Desktop composition enabled: Yes
Displays: 1) 2560x1440, 2) 2560x1440
Input types: Multitouch: No, Integrated touch: No, Integrated pen: No, External touch: No, External pen: No, Keyboard: No

Graphics Processor Info:
DirectX: NVIDIA GeForce RTX 2080 (30.0.14.7212)

Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic
Library Path: C:\Users\jltd9\Pictures\Lightroom\Lightroom Catalog-v10-v11.lrcat
Settings Folder: C:\Users\jltd9\AppData\Roaming\Adobe\Lightroom

Installed Plugins:
1) AdobeStock
2) Facebook
3) Flickr
4) Nikon Tether Plugin

Config.lua flags: None

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Report · Feb 07, 2022

Thanks for the help on workarounds. I've tested the 6 core workaround and that seems to be working fairly well for me right now, though it makes launching a bit more annoying since I can't pin a shortcut to the .bat to my taskbar for some reason, at best adding it to my lightroom taskbar icon for right click access.

Report · Feb 07, 2022

"I can't pin a shortcut to the .bat to my taskbar for some reason"

This method worked for me:

https://www.easytechguides.com/pin-a-batch-file-to-the-taskbar-or-start-menu-in-windows-10/#windows-...

Report · Feb 07, 2022

I recently wrote, "Given that this problem hasn't been addressed in the five years since it was first reported..."

LR 11.2 was just released, and its splash screen suggests the problem may have been at least partially fixed in 11.2:

There's no mention of this in the release notes (yet).

@Solemn193, let us know how much 11.2 addresses the issue for you.