Lightroom Classic: Problem with previews during import for large volume/slower than LR CC2015.12

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  • Problem
  • Updated 4 months ago
  • Solved
  • (Edited)
LR Classic CC 7.0 Windows 7 w/ATI Radeon 5700
no renaming or presets, minimal previews selected
(1.8 Gb HD with 171 Gb free at the end of this import)

Preview generation/ status update tasks are not quite running in parallel with the file import??:

With an import of 887 D500 photos the library grid display shows blank grid area with "importing files" and the file counters do not change from zero for some time.

After starting the import yesterday for the first time I thought LR had crashed as there was no changes onscreen for about 5min.
However, after cancelling this import and restarting LR I found that there were photos in the destination (not showing in LR though)

Removed photos from the hard drive and started everything again this time I watched the file folder in explorer to see what was going on:

Started import @ 12:36pm
(12:45pm) After 223 photos show up in the destination directory in Windows explorer then LR grid view finally shows 8 thumbnails in the destination folder, the current import collection counter says zero & first sliver of progress appears on the status bar (this is quite late in the process to see first indication of progress)
This continues along until @ 1:14pm the destination directory had all 887 photos in it **.
LR showed only 142 thumbnails and the current import collection counter showed 30, the import process continued on until 1:35pm with all photo thumbnails finally being created.

In the destination folder there were two temporary folders created: "Temporary folder" with a HASH# and "TempParent"
TempParent contained "Temporary folder" with a HASH# folder and a 2nd copy of each of the imported photos
As the thumbnails were finally created these temporary copies were removed.
** When all of the files were copied off the card I still had 600+ extra temp folders so the import was taking almost double the space at this time.

I ran an 2nd import with 66 photos from different card reader and same process exists but thumbnail generation task keeps up better with the import so everything looks ok.
(1st card is XQD, 2nd is SDXC)
I had made several other small test imports with LR Classic to test it and everything seemed normal but this was the first large import.

Ran import with LR CC2015.12 using the same photos and the "TempParent" folder does not appear.
Just the "Temporary folder" and there is at most only one temp photo copy present in that folder while the import runs.
It took just under 4min to import and display thumbnails for 1st 225 photos, thumbnail generation was only at most 40 behind what was imported on disk.
Complete import with previews completed in 14min. So 1/4 time than LR Classic.

For some reason the temp copies/thumbnails are not keeping up in parallel to the import with larger volume imports?
Makes it look like LR crashed when there is no evidence of progress in Lightroom for 5-10min after it starts even though it is working?
And import process takes more disk space than it should.

Hopefully, I explained this ok.


Sysinfo taken after import completed:

Lightroom Classic version: 7.0 [ 1140024 ]
License: Creative Cloud
Operating system: Windows 7
Version: 6.1
Application architecture: x64
System architecture: x64
Logical processor count: 8
Processor speed: 2.6 GHz
Built-in memory: 9206.9 MB
Real memory available to Lightroom: 9206.9 MB
Real memory used by Lightroom: 3335.9 MB (36.2%)
Virtual memory used by Lightroom: 3287.4 MB
GDI objects count: 785
USER objects count: 2245
Process handles count: 3425
Memory cache size: 243.0MB
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2
Camera Raw virtual memory: 231MB / 4603MB (5%)
Camera Raw real memory: 231MB / 9206MB (2%)
System DPI setting: 96 DPI
Desktop composition enabled: Yes
Displays: 1) 1920x1200, 2) 1680x1050
Input types: Multitouch: No, Integrated touch: No, Integrated pen: No, External touch: No, External pen: No, Keyboard: No

Graphics Processor Info:
OpenGL: AMD Radeon HD 5700 Series
Check OpenGL support: Passed
Vendor: ATI Technologies Inc.
Version: 3.3.13417 Core Profile Context 15.301.1901.0
Renderer: AMD Radeon HD 5700 Series
LanguageVersion: 4.40
Total Video Memory: 1011 MB

Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic CC
Library Path: C:\Lightroom Catalog\LR7\LR7 Master.lrcat
Settings Folder: C:\Users\Bruce\AppData\Roaming\Adobe\Lightroom

Installed Plugins:
1) Facebook
2) Flickr
3) HDR Efex Pro 2
4) jf Zenfolio
5) Nikon Tether Plugin
6) ON1 Effects 10
7) ON1 Enhance 10
8) ON1 Photo 10
9) ON1 Photo RAW 2017
10) ON1 Portrait 10
11) ON1 Resize 10
12) ON1 Resize 2017

Config.lua flags:
AgView.disableDirect2D = true

Adapter #1: Vendor : 1002
    Device : 68b8
    Subsystem : 25431002
    Revision : 0
    Video Memory : 1010
AudioDeviceIOBlockSize: 1024
AudioDeviceName: Speakers (Realtek High Definition Audio)
AudioDeviceNumberOfChannels: 2
AudioDeviceSampleRate: 48000
Build: 10.0x7
Direct2DEnabled: false
GL_RENDERER: AMD Radeon HD 5700 Series
GL_VENDOR: ATI Technologies Inc.
GL_VERSION: 4.5.13417 Compatibility Profile Context 15.301.1901.0
GPUDeviceEnabled: false
OGLEnabled: true
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Bruce Houstoun

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Posted 3 years ago

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Photo of Ronald Byram

Ronald Byram

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HEy Bruce, Thanks for the details. I too have similar issue during import. I even went and reset LR. still today trying to import 3 Raw CR2 files and the system seems out of sync. I am trying to use that imbed/side car option. will change oto normal way and see what I get.
Photo of JonathanB


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This definitely seems to be an issue with large catalogues that have been converted to Classic.

I have tested this exhaustively in such a way as to rule out all variables relating to hardware and preference settings etc. So the new Classic import system works as advertised and is super speedy on my laptop and my desktop with a small catalogue.  The previews start populating the grid view as soon as import is started and is particularly fast with the 'use embedded previews checked’. So I know exactly how this behaves when it works properly.

However on my large main catalogue, which has 177,000 images, the previews do not start populating the grid when import is started. Instead my experience is very similar to Bruce’s.The progress bar says two operations are in progress but moves painfully slowly and there is a long wait while the grid view is empty, nothing appears to be happening and the import count remains at zero. Eventually a few previews start appearing and then a while later they all appear at once. The intended behaviour is for the previews to appear in batches so you can start viewing them immediately but instead the grid view is empty and one can do nothing but wait with the result that the overall import  experience is much much slower than 2015.12.

NB Because of the tests I have done it is clear that the problem is to do with the large catalogue and not the hardware, operating system or any preference settings  as both the laptop and desktop work fine with small catalogues (with identical preference settings) and both the laptop and desktop exhibit this major slowdown using the same large catalogue.

There are a number of similar threads in this and other forums. I hope Adobe take note and acknowledge that this is a serious flaw that needs addressing urgently. 
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Mayuri Jain, Employee

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Hi Jonathan B,

We will look into the issue. In case you are experiencing import issues while generating previews in parallel then there is an option to disable parallel previews generation from Preferences option.

Go to Preferences> Performance.
Uncheck "Generate Previews in Parallel" checkbox

Could you please give it a try and let us know in case you still face this issue? 
We will further investigate the issue. 

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Bruce Houstoun

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Little to no difference with the 'Generate previews in parallel' checked or not.
Also cleared Camera Raw and Video caches and renamed the Catalog previews.lrdata folder to see if that would help. Again no significant change.
Each time the previews do not show up in LR until all photos are copied off the XQD card and the temp copies take up additional disk space until they clear (so I need nearly double space that the card holds to perform an import) Also repeated this with SD card reader so not a problem with the reader.  Only using a new/very small catalog helps.
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Kate Marchio

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Has Adobe explained or fixed this issue yet? This is creating massive problems for workflow and importing speed. I've been using Lightroom for years, ever since this latest update of the Lightroom 2018 CC, importing photos has become painfully slow. I have not changed anything about my workflow, hardrives, settings, etc. It used to take 10 mins to import a 32GB card, now it takes over an hour or more for only around 60 photos... trying to import hundreds takes multiple hours. Is anyone else having this issue? I have not changed any settings for import. Please help Adobe.
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Bruce Houstoun

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After reading JonathanB's post I tested the times for my desktop with a new catalog and my converted master catalog on my laptop. Results are the same as JonathanB, the very large catalog converted from LRCC2015.12-> LR Classic catalogs perform much slower than new catalogs on the same computer.

LR converted Catalog (438000 photos) - 59 min
new test catalog (172 photos) - 18 min
(time using master catalog on LR CC2015.12 is 14min)

LR converted catalog (438000 photos)- 21 min
New Catalog (0 photos)- 4 min

(Laptop times are faster as there is a faster usb3 port for the xQD card reader, all times are for 887 D500 photos from same XQD card reader to same local C: drive as the catalog)

On the small/new catalogs previews show up right away,  initially temp folders exist for every photo but it seems there are only about 20-30 photos present at a time within them and they clear out faster.

On the converted catalogs the previews show up generally only after all files finish copying to destination folder (sometimes 6-20 show up earlier) then temp folder copies disappear as previews are generated.
Temp folders hold many more photos ~90-95% of the entire import until the last photo gets copied over before being cleared. So the import requires nearly double disk space while it runs.
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Bruce Houstoun

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Well, I tried the imports again on a 3rd computer by installing a fresh copy of the LR Classic trial on a computer at work.

When I ran the import of 200 Nikon D500 raw files with the initial install/default catalog this import took about 3min.
Then, I repeated the same import this time using a copy of my master catalog from home (with no previews), this time the import took just under 7min. (so about twice the time)

With the 1st import as it ran the previews started showing up immediately in the "previous import" collection as the photos were copied to the destination folder. The temp folder count while initially was 200, they quickly disappeared as previews were generating. When the last photo was finished being copied, the temp folder cleanup was only a few photos behind.

On the 2nd import the import matched the same slow behaviour I have on my 2 computers at home while using the large catalog:
No previews show in the "Previous import" collection, however the counter does show some small incremental increase.
After all photos were copied to the destination folder at this point the process was just a bit behind the time for the complete import process with the other catalog, but the temp folder count is substantially behind (156 temp folders remaining) It continues to process with it only generating previews/cleaning up the temp folders.
Once all the temp folders are cleaned up then the previews show onscreen all at once.

On my other tests if there are 300+ photos being imported then preview display in the Previous import collection does catch-up a bit to at least show there is something going on but only after 5-6min of seeing nothing.
(I did not click mouse on any collections etc. for either test/ hands off keyboard too)

So, whatever the issue I have is it seems to be tied to the catalog file vs. any other config/preferences? (3 separate installs of LR now all show same problem using same catalog)

Are there any other suggestions/steps that I may try?
Adobe support: I can provide a copy of the problem catalog file via Google drive if you send me a PM.

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Thank you Mayuri for looking into this and thanks Bruce for your extra info.

For added detail on my set up:
Desktop:  Mac Pro (mid2010) 16GB Memory Mac Sierra 10.12.3, ATI Radeon HD5770 1024MB with1TB internal SSD
Laptop: MacBook Pro Retina (Early 2013), 2.7 Ghz Intel i7, 16GB Memory, Mac sierra 10.12.3, Intel Graphics 4000 1536 MB with 500GB internal SSD

Lightroom Classic 7.0.1 is installed on both machines. Main Lightroom catalogue folder is stored on External SSD, Original files stored on USB3 External 7200 RPM Drives
My original comments were therefore based on testing the identical large catalogue powered by Desktop or Laptop (connected to same external drive) as well as various permutations of new/small catalogues on the separate machines.

I have now done a new test on the same large catalogue with the ‘Previews in parallel’ option checked and unchecked. Import options set to Embedded and Sidecar.
It is slightly faster with ‘Previews in Parallel' checked (enabled)
I have only tried this on the Desktop. For the purposes of this test files were set to import into a folder on the Internal SSD.

1. Timeframe of onscreen information when importing 50 images (2GB) using USB3 Card Reader - 'Previews in Parallel’ UNCHECKED

0-10 seconds -  ‘Copy and Import’,  Current Import Count reads 0, Grid view says ‘Importing files’, No previews showing.
at 10 seconds - '2 operations in progress’, Current Import Count 0, Grid view says ‘Importing files’, No previews showing.
at 31 secs  -'2 operations in progress’, Current Import Count 1, Grid view says ‘Importing files’, No previews showing.
at 39 seconds - ‘Copy and Import’, Current Import Count 1', Grid view says ‘Importing files’, No previews showing.
at 1min 20 - ‘2 Operations in progress’, Current Import Count 4' , Grid view says ‘Importing files’, No previews showing.
at 2min 10sec - '2 Operations in progress’, Current Import Count 16', Grid view FIRST PREVIEWS APPEAR.
at 2min 15sec - ‘Fetching Initial Previews'
at 2 min 47 process complete.

2. Identical import of same images with same set up except ‘Previews in Parallel’ CHECKED
First 3 previews appear in grid after 50 seconds followed by all the rest at 1 min 50secs
Whole process completes 2 min 11 secs.

I have taken videos if you would like me to send these to you.

NB these tests are just with importing 50 files (2GB) - a full 32 GB card, typical for a day’s shoot, obviously takes much much longer! No previews appear in the Grid view for many minutes then all arrive more or less at once at the very end.
My sense is that tests results are somewhat inconsistent but I don’t have the time to test and record results exhaustively with every variable and permutation.

As previously stated on both machines, when running smaller catalogues, the Previews start loading instantly in grid view so you can start culling them - which I assume is the intended behaviour regardless of catalogue size.
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Kate Marchio

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This is interesting, yet why would Lightroom make it slow for professionals that have large catalogs? My catalog sizes are going to be massive and that isnt going to change? So why would Adobe handicap the pros using their software? How can this be fixed without changing catalog size? Import speeds are painfully slow and are really creating a major issue in workflow and efficiency. Especially because up until now it worked just fine. Adobe dont take away features that are good for your users. When you compromise user experience you are compromising your key users.
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I’m quite sure they did not do this on purpose. According to their PR, the whole point of the recent changes was that they could now focus on making speed improvements in Classic for heavy duty users. This must be an unintended bug introduced as a result of this aspect of Lightroom code being re-written. I experimented reverting to my old method from a few years ago of transferring files from card reader to disk with Finder and then importing into Lightroom direct from the folder however even that had the same problem of previews not appearing in the grid until the end of the import process.
I believe some people are importing into smaller catalogues for urgent time-critical work and then exporting as a catalogue and transferring to their main catalogue at a later date but this seems like too much of a faff to me, so for the moment I’m just trying to be patient and setting downloads to import whilst I have something else to do.

Hopefully they will come up with a fix soon.
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Sean Molin

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Same problem. Abysmal import speed and previews basically don't show up.
And turning off concurrent preview generation wouldn't help, because this slow down is during the actual import before previews begin generation.
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Mayuri Jain, Employee

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Hi Sean,
Could you please try import with minimal previews in new catalog and let us know the time taken to complete import operation in LR classic?
Please also mention the no. and type of images you are trying to import.

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Hi Mayuri,
I forgot to mention that when testing (as per my post above) I also experimented with using the minimal or standard preview generation settings (as well as embedded and sidecar). It made no difference to the behaviour in the larger catalogue (previews only start appearing in Grid view towards the end of the process) whereas as all options work perfectly in new or small catalogues on both laptop and desktop (with previews appearing instantly). Happy to send videos if you want.
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Philippe Coudé du Foresto

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I too experienced the same problem with LR Classic 7.0.1
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Terri Glanger

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Same problem - cannot believe there is no fix to this yet.  My import time is excruciating and only a few photos show up (like 3) until the import is finished.  I'm a commercial photographer and this is really problematic.  I hope there is a bug fix to this SOON.  
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Chris Hitchcock

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I've resorted to sorting and culling in Perfect Browse, then importing only my urgent edits into Lightroom. The rest get done overnight. It's a pretty pathetic situation for such a major software vendor to have created.
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Kate Marchio

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Now I just updated again and it wont fully import my card, I only have around 50 photos to import and a few short videos and it gets around 95% of the way across the bar and then it just never completes, I let it fun for several hours it wont import the card fully.  This needs to be fixed immediately Adobe!
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Bruce Houstoun

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I see that Adobe has replied in another thread that they were able to replicate this issue with large catalogs and slow imports.

Now to sit back and wait for Classic 7.1 for the fix.
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Phil Jack

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Lightroom Classic CC slow to create 1:1 Previews during import?

It's a massive bug in 7.0.1! Roll back to 7.0.0 and you'll be back to normal.

Launch the Adobe Creative Cloud app.
On the Apps tab, click on the drop down arrow next to Lightroom Classic CC and choose Other Versions.
Choose 7.0 and click Install
Be amazed that Adobe could screw up Lightroom so badly but revel in the fact that you are working again.
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Grant Gunderson

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I too am having the same problem on a 2017 MacBook Pro. Library is 483K. Just tried to import 50 images and its taking over an hour and thats a full SSD machine storing to only SSD drives.  Did Adobe even test this update before releasing it?
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Bruce Houstoun

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Some improvement for importing with LR7.1:
Importing of same 887 photos now took 36 min vs previous 59min and some previews started showing onscreen immediately but still not as fast a new catalog or using LR2015.12
Will repeat tests with clean catalog and on laptop tomorrow.
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Reetesh Mukul, Employee

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I have few questions:
  1. How much time Import was taking on LR2015.12 vs LR7.1 ?   This is just Import completion time.
  2. How much time Preview took  on LR2015.12 vs LR7.1 ?
  3. Are you using Windows or Mac ? SdCard or Non-SdCard ? If you are using SdCard and MAC can you try Import with Folder Tree instead of Devices option.
  4. Please calculate above with Import + Minimal
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Bruce Houstoun

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Using LR on Windows 7
Test with Master catalogs that have 435000+ photos and a very small LR7 test catalog with only 172 photos in it prior to the tests. Importing 887 D500 photos using Lexar XQD card reader

LR7.1  (master catalog) - 36min
LR7.1 (small catalog)  -21 min

Lr2015.12 (master catalog) - 15min

** Update as I decided to record the time for a direct Windows file copy followed by use LR import from harddrive using add mode I saw that I had TeraCopy running as my default file handler.
Disabled TeraCopy and ran the Windows file copy/LR Add - 15.5min

Re-ran LR7.1 import with TeraCopy disabled and import was now down to 20min.
So not as fast as LR2015 but disabling TeraCopy made quite a improvement.

Will test LR7.1 tomorrow with my laptop (which does not have Teracopy) to see how it performs there. Old LR CC2105 was not affected by TeraCopy to the same extent it seems as for LR7.x

So for the most part it seems to be working better, except the creation of the files in the temp folder still accumulate causing the import to use more disk space while running. There is about 1.5-1.75 times the total disk space used temporarily as compared to the imported file size total.
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Reetesh Mukul, Employee

  • 49 Posts
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I will wait for results on your laptop. What is Storage technology for your this Windows 7 System ? Is it HDD based on SSD based?
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William Carey

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Can someone tell me if Adobe have answered this upload speed problem anywhere. Unbelievably slow uploading 300 images. Though problem was my laptop until I found this thread!
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Rebecca Douglas

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Is there a solution to this yet? I am sat backing up in the middle of a wedding, while everyone eats and so far in over an hour 27 RAWs have imported. I would normally have had everything I'd shot from morning prep - sit down meal imported and backed up by this point. Working on macbook with no power supply and I am down to 65% battery so there is no way I am going to be backed up before I need to shoot again and before the battery runs out. This will massively effect the service of same day previews that I offer! HEEEEEELP!!!!!
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Todd Shaner, Champion

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Try using Finder to transfer the remaining files directly to the target HDD folder. Once completed right-click on the folder inside LR and select Synchronize folder. See if that speeds up the process.
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Matthew Wilks

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My import time for a 64Gb card with 800 or so D810 files is now 2-4 hours compared to 20 minutes before... LR, explain... but first fix!!! Paying you money and every 'fix' makes it less functional! Seriously looking at your competition now, its just too painful for a 500Gb wedding!
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Aernout Steegstra

  • 4 Posts
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Curious I am if this is gonna be fixed asap. I am a genuine LR junkie but I feel really uneasy here. I háve to run but feel crippled. PLEASE FIX IT!!
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Aernout Steegstra

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I can't believe a giant market leader as Adobe can't fix this problem witch has been going on for 7 months now. Countless professionals all over the world depend on you. It should be flawless, don't you agree?
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  • 14 Posts
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Sorry to hear you still have an issue. This was fixed for me some time ago with the 7.2 update and I believe they have ironed out some other import  issues with subsequent updates. 
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Aernout Steegstra

  • 4 Posts
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Thanks for your reply JonathanB, I have recently updated to 7.4 and the problem has become worse. Importing 40 Raw files takes over an hour!
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d c

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I just upgraded to Classic CC 8.0 and my old catalogue was upgraded as well, and now I have this problem. It's also a huge catalogue. I tried everything listed here. I also tried selecting the color profile sRGB IEC61966-2.1 as per Adobe's suggestions. None of that worked. I can't see any previews for any of my images in my entire catalogue.

 Any fixes yet?

Turns out I had both upgraded Lightroom Classic CC AND accidentally installed Lightroom CC. I uninstalled Lightroom CC, and now LR Classic CC is working. Phew!
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Jovanni Casaus

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I am having the same issue. Just started today. I am on vr 8.1. Wondering if they did something again since the last updates from vr 7.x. This seriously hinders workflow. Any suggestions Adobe. 
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William Brown

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I'm also having the same problem, I just upgraded from 2015 to 8.2. It is taking a very long time to import.

Thank you.