LrC 14.3 preview generation much slower

Report · Apr 28, 2025

After noticing switching images in Develop was significantly slower in 14.3 I did some further testing against 14.2 - in each case I did the following steps.
Renamed Prefs, etc so app behaves as a clean install
Created a new catalog
Imported 480 images with minimal previews
Selected all images in Library and created 1:1 previews

14.2 took 313s
14.3 took 710s

I also note that 14.3 seems to have a fix to stop thumbnails reverting to embedded previews and wonder if that fix has caused the new issue.

Windows 11, 24H2 build: 26100.3775, Ryzen 3900x, RTX 3080, 64gb ram

Report · Apr 28, 2025

Thanks for the detailed analysis. Please share some specifics about your workflow:
What format of images are you working on?
Where are the catalog & source images stored, internal or external drives?
Please include the System info as well.

Thanks!
Sameer K

(Type '@' and type my name to mention me when you reply)

Report · Apr 28, 2025

@Sameer K
Images are .cr3 files from Canon R6mk2s
Catalog stored on an internal NVMe drive which is exclusively for catalog files
Images on internal 4tb SSD which is excusively for images
OS/Apps on seperate NVMe.

Lightroom Classic version: 14.3 [ 202504141032-10373aad ]

License: Creative Cloud

Language setting: en

Operating system: Windows 11 - Home Premium Edition

Version: 11.0.26100

Application architecture: x64

System architecture: x64

Logical processor count: 24

Processor speed: 3.7GHz

SqLite Version: 3.36.0

CPU Utilisation: 0.0%

Power Source: Plugged In

Built-in memory: 65446.7 MB

Dedicated GPU memory used by Lightroom: 4676.8MB / 10053.0MB (46%)

Real memory available to Lightroom: 65446.7 MB

Real memory used by Lightroom: 7723.3 MB (11.8%)

Virtual memory used by Lightroom: 10165.2 MB

GDI objects count: 823

USER objects count: 2547

Process handles count: 3222

Memory cache size: 4441.0MB

Internal Camera Raw version: 17.3 [ 2222 ]

Maximum thread count used by Camera Raw: 5

Camera Raw SIMD optimization: SSE2,AVX,AVX2

Camera Raw virtual memory: 2292MB / 32723MB (7%)

Camera Raw real memory: 2539MB / 65446MB (3%)

Cache1:

Final1- RAM:605.0MB, VRAM:2858.0MB, R6A_5602.CR3

Final2- RAM:189.0MB, VRAM:0.0MB, R6A_5599.CR3

Final3- RAM:189.0MB, VRAM:0.0MB, R6A_5604.CR3

NT- RAM:983.0MB, VRAM:2858.0MB, Combined:3841.0MB

Cache2:

m:4441.0MB, n:566.6MB

U-main: 96.0MB

System DPI setting: 144 DPI (high DPI mode)

Desktop composition enabled: Yes

Standard Preview Size: 3840 pixels

Displays: 1) 3840x2160

Input types: Multitouch: No, Integrated touch: No, Integrated pen: Yes, External touch: No, External pen: Yes, Keyboard: No

Graphics Processor Info:

DirectX: NVIDIA GeForce RTX 3080 (32.0.15.7602)

Init State: GPU for Export supported by default

User Preference: Auto

Enable HDR in Library: OFF

Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic

Library Path: G:\Lightroom Catalogs\Charlotte & Sam\Charlotte & Sam.lrcat

Settings Folder: C:\Users\Andy Jones\AppData\Roaming\Adobe\Lightroom

Installed Plugins:

Config.lua flags:

Adapter #1: Vendor : 10de

Device : 2216

Subsystem : 403e1458

Revision : a1

Video Memory : 10053

Adapter #2: Vendor : 1414

Device : 8c

Subsystem : 0

Revision : 0

Video Memory : 0

AudioDeviceIOBlockSize: 1024

AudioDeviceName: System Default - Speakers (Realtek(R) Audio)

AudioDeviceNumberOfChannels: 2

AudioDeviceSampleRate: 48000

Build: LR5x26

Direct2DEnabled: false

GL_ACCUM_ALPHA_BITS: 16

GL_ACCUM_BLUE_BITS: 16

GL_ACCUM_GREEN_BITS: 16

GL_ACCUM_RED_BITS: 16

GL_ALPHA_BITS: 0

GL_BLUE_BITS: 8

GL_DEPTH_BITS: 24

GL_GREEN_BITS: 8

GL_MAX_3D_TEXTURE_SIZE: 16384

GL_MAX_TEXTURE_SIZE: 32768

GL_MAX_TEXTURE_UNITS: 4

GL_MAX_VIEWPORT_DIMS: 32768,32768

GL_RED_BITS: 8

GL_RENDERER: NVIDIA GeForce RTX 3080/PCIe/SSE2

GL_SHADING_LANGUAGE_VERSION: 4.60 NVIDIA

GL_STENCIL_BITS: 8

GL_VENDOR: NVIDIA Corporation

GL_VERSION: 4.6.0 NVIDIA 576.02

GPUDeviceEnabled: false

OGLEnabled: true

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Report · Apr 28, 2025

@Sameer K

For information only. I am unable to reproduce the issue described above on 3 separate Mac computers (M1 Ultra, M3 Max and M3 MacBook Air). Each of the computers is running Sequoia 15.4.1.

Report · Apr 28, 2025

I've tested on 2 windows machines, both showing the slow down.

Report · Apr 28, 2025

It would be helpful if another Windows users obtained similar results when using 14.2 and 14.3.

Report · Apr 28, 2025

@ShootingPixelsAndy

we don't need two threads on the exact same problem, let's continue to discuss here: https://community.adobe.com/t5/lightroom-classic-discussions/14-3-much-slower-switching-images-in-de...

Report · Apr 28, 2025

@dj_paige

The 1:1 preview issue described above is not the same issue that the op originally raised in the thread you refer to. That thread relates to Embedded Previews, although I acknowledge that the OP did also mention 1:1 in a later post.

Report · Apr 28, 2025

@dj_paige Really? After suggesting I submit it as a bug you then complain because I have?

Report · Apr 28, 2025

Bug reports do not go in the "Discussion" part of the forum, which is where you placed it. They go in the "Bugs" part of the forum. Also, to report bugs, you need to provide step-by-step instructions, which you did in your first thread, but not in the 2nd thread. https://community.adobe.com/t5/lightroom-classic-bugs/p-how-do-i-write-a-bug-report/idi-p/12386373

Report · Apr 28, 2025

@dj_paige and bugs is where I posted it. I don't know why or who moved it.
@Sameer K was it you?

Report · Apr 28, 2025

@dj_paige @ShootingPixelsAndy
Please read: https://community.adobe.com/t5/lightroom-classic-bugs/p-do-i-post-in-discussions-or-bugs/idi-p/13691...

Rikk Flohr: Adobe Photography Org

Report · Apr 28, 2025

Hey, @ShootingPixelsAndy. I did move the post to discussions. I've shared the details with our team, and if Lightroom behaves as reported, I'll move it back to bugs and set the status appropriately.

You can read more about posting bugs here: <Rikk shared above>

Thanks!
Sameer K

Report · Apr 28, 2025

@Rikk Flohr: Photography I posted in bugs at the suggestion of @dj_paige who then complained I'd created a duplicate post in discussions, I hadn't. Damned if I do....

Perhaps it would be useful if admins/mods stated they've moved a post when doing so and why to save all the grief and confusion. Posting in these forums is often painful, overly bureaucratic and far from encouraging.

Report · Apr 28, 2025

"I posted in bugs at the suggestion of "

That is why I tagged you both in the post explaining forum best practices.
Now you both have the same information.

Rikk Flohr: Adobe Photography Org

Report · Apr 28, 2025

If the assumption is that new posts in bugs aren't bugs don't let users make new posts there in the first place and save the hassle? All I want to do is report a problem I've encountered but, as always, I spend more time jumping through hoops and doubting my own existence than actually getting any help.

I even bit the bullet and tried to contact support knowing full well I was in for an hour or more of scripted responses of things I'd already tried and done, but having waited and waited I was dumped out of the chat due to "my" inactivity waiting for an agent to pick up the request.

Report · Apr 27, 2025

Anyone else notice that moving between images in 14.3 is significantly slower than 14.2?
In 14.2 the switch is almost instant, even outside of the cached range. In 14.3 just clicking on the next image in the strip and the delay is 2 or 3 seconds.

Tested with a brand new catalog and vanilla settings.

I did notice that 14.3 seems to have a fix for thumbnails no longer reverting to the embdedded preview once they've been viewed in Develop so I wonder if the slow down is somehow related to that "fix"?

Report · Apr 27, 2025

I have not noticed that in LrC 14.3, Windows 11. Please provide your system information (Help->System Info)

Try resetting preferences https://www.lightroomqueen.com/how-do-i-reset-lightrooms-preferences/

Try clearing the LrC cache https://www.bwillcreative.com/how-to-clear-your-lightroom-cache/

Report · Apr 27, 2025

As stated above, I have checked with a clean install with vanilla prefs, etc. still the same. Further testing shows it is definitely related to embedded previews.

Lightroom Classic version: 14.3 [ 202504141032-10373aad ]

License: Creative Cloud

Language setting: en

Operating system: Windows 11 - Home Premium Edition

Version: 11.0.26100

Application architecture: x64

System architecture: x64

Logical processor count: 24

Processor speed: 3.7GHz

SqLite Version: 3.36.0

CPU Utilisation: 0.0%

Power Source: Plugged In

Built-in memory: 65446.7 MB

Dedicated GPU memory used by Lightroom: 4676.8MB / 10053.0MB (46%)

Real memory available to Lightroom: 65446.7 MB

Real memory used by Lightroom: 7723.3 MB (11.8%)

Virtual memory used by Lightroom: 10165.2 MB

GDI objects count: 823

USER objects count: 2547

Process handles count: 3222

Memory cache size: 4441.0MB

Internal Camera Raw version: 17.3 [ 2222 ]

Maximum thread count used by Camera Raw: 5

Camera Raw SIMD optimization: SSE2,AVX,AVX2

Camera Raw virtual memory: 2292MB / 32723MB (7%)

Camera Raw real memory: 2539MB / 65446MB (3%)

Cache1:

Final1- RAM:605.0MB, VRAM:2858.0MB, R6A_5602.CR3

Final2- RAM:189.0MB, VRAM:0.0MB, R6A_5599.CR3

Final3- RAM:189.0MB, VRAM:0.0MB, R6A_5604.CR3

NT- RAM:983.0MB, VRAM:2858.0MB, Combined:3841.0MB

Cache2:

m:4441.0MB, n:566.6MB

U-main: 96.0MB

System DPI setting: 144 DPI (high DPI mode)

Desktop composition enabled: Yes

Standard Preview Size: 3840 pixels

Displays: 1) 3840x2160

Input types: Multitouch: No, Integrated touch: No, Integrated pen: Yes, External touch: No, External pen: Yes, Keyboard: No

Graphics Processor Info:

DirectX: NVIDIA GeForce RTX 3080 (32.0.15.7602)

Init State: GPU for Export supported by default

User Preference: Auto

Enable HDR in Library: OFF

Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic

Library Path: G:\Lightroom Catalogs\Charlotte & Sam\Charlotte & Sam.lrcat

Settings Folder: C:\Users\Andy Jones\AppData\Roaming\Adobe\Lightroom

Installed Plugins:

Config.lua flags:

Adapter #1: Vendor : 10de

Device : 2216

Subsystem : 403e1458

Revision : a1

Video Memory : 10053

Adapter #2: Vendor : 1414

Device : 8c

Subsystem : 0

Revision : 0

Video Memory : 0

AudioDeviceIOBlockSize: 1024

AudioDeviceName: System Default - Speakers (Realtek(R) Audio)

AudioDeviceNumberOfChannels: 2

AudioDeviceSampleRate: 48000

Build: LR5x26

Direct2DEnabled: false

GL_ACCUM_ALPHA_BITS: 16

GL_ACCUM_BLUE_BITS: 16

GL_ACCUM_GREEN_BITS: 16

GL_ACCUM_RED_BITS: 16

GL_ALPHA_BITS: 0

GL_BLUE_BITS: 8

GL_DEPTH_BITS: 24

GL_GREEN_BITS: 8

GL_MAX_3D_TEXTURE_SIZE: 16384

GL_MAX_TEXTURE_SIZE: 32768

GL_MAX_TEXTURE_UNITS: 4

GL_MAX_VIEWPORT_DIMS: 32768,32768

GL_RED_BITS: 8

GL_RENDERER: NVIDIA GeForce RTX 3080/PCIe/SSE2

GL_SHADING_LANGUAGE_VERSION: 4.60 NVIDIA

GL_STENCIL_BITS: 8

GL_VENDOR: NVIDIA Corporation

GL_VERSION: 4.6.0 NVIDIA 576.02

GPUDeviceEnabled: false

OGLEnabled: true

GL_EXTENSIONS: GL_AMD_multi_draw_indirect GL_AMD_seamless_cubemap_per_texture GL_AMD_vertex_shader_viewport_index GL_AMD_vertex_shader_layer GL_ARB_arrays_of_arrays GL_ARB_base_instance GL_ARB_bindless_texture GL_ARB_blend_func_extended GL_ARB_buffer_storage GL_ARB_clear_buffer_object GL_ARB_clear_texture GL_ARB_clip_control GL_ARB_color_buffer_float GL_ARB_compatibility GL_ARB_compressed_texture_pixel_storage GL_ARB_conservative_depth GL_ARB_compute_shader GL_ARB_compute_variable_group_size GL_ARB_conditional_render_inverted GL_ARB_copy_buffer GL_ARB_copy_image GL_ARB_cull_distance GL_ARB_debug_output GL_ARB_depth_buffer_float GL_ARB_depth_clamp GL_ARB_depth_texture GL_ARB_derivative_control GL_ARB_direct_state_access GL_ARB_draw_buffers GL_ARB_draw_buffers_blend GL_ARB_draw_indirect GL_ARB_draw_elements_base_vertex GL_ARB_draw_instanced GL_ARB_enhanced_layouts GL_ARB_ES2_compatibility GL_ARB_ES3_compatibility GL_ARB_ES3_1_compatibility GL_ARB_ES3_2_compatibility 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Report · Apr 27, 2025

As stated above, I have checked with a clean install with vanilla prefs, etc. still the same. Further testing shows it is definitely related to embedded previews.

By @ShootingPixelsAndy

Clean install does not delete the preference file. I do not know about cache.

Please explain: "further testing shows it is definitely related to embedded previews".

Report · Apr 27, 2025

I renamed all the root Adobe folders in AppData so it was a clean install.

Further testing shows loading images with the embedded preview badge is noticably slower than those with an existing preview when compared to 14.2 doing the same thing.

14.3 switching images: https://youtu.be/opBeEpPBBGo
Notice that when I click on an image with an embedded preview badge it takes over a second to appear.

14.2 switching images: https://youtu.be/F_biAOyiQJs

This time images appear almost instantly with embedded preview badge and even much further along the strip.

Report · Apr 27, 2025

Ok, thank you, this is very clear now. Perhaps you should submit it as a bug.

Report · Apr 27, 2025

What type of drive is G:? Interface?

Ken Seals - Nikon Z 9, Z 8, 14mm-800mm. Computer Win 11 Pro, I7-14700K, 64GB, RTX3070TI. Travel machine: 2021 MacBook Pro M1 MAX 64GB. All Adobe apps.

Report · Apr 28, 2025

@KR Seals G is a 2TB NVMe

Report · Apr 27, 2025

[This post contains formatting and embedded images that don't appear in email. View the post in your Web browser.]

Looking at your screen recordings closely, in LR 14.2, when you click on a thumbnail showing the embedded-preview badge, Develop shows the embedded preview briefly and then replaces it with a camera-raw rendered version of the full image. But in your LR 14.3, it doesn't show the embedded preview initially -- it just waits until the camera-raw rendered version is finished and then displays that.

On my Mac LR, I don't notice any change in behavior in LR 14.3