P: Resizing window causes screen to flash in Develop module

[dirkr30048664]

Hi everybody!

I have been using Lightroom for over 10 years.

On my old laptop with Intel Core i7 4720HQ, NVIDIA GeForce GTX 960M and 16 GB RAM, the screen was always slow when I zoomed in or out of the LR window and you could clearly see the individual parts of LR building up.

Now I have a brand new PC: AMD Ryzen 9950x, NVIDIA RTX 5070, 96 GB RAM. I assumed that everything would just load smoothly. It does, but not with LR Classic! GPU is activated in the settings of LR. Why is that?

[Frank Biganski]

Hiya,
I've been having this problem for a while but I've just lived with it. I found several responces to this issue but none of the suggestions seem to help.  When I am resizing Lightroom Classic display window, which I often fo during the initial set up of my workspaces, the preview window flashes.  See this sample video.
https://app.screencast.com/QjN55IfkF4TL3

I'm wondering if I may need to update my Nvidia 2060 Super graphics card or perhaps, increase my RAM from 32 GB. I edit property photo RAW images.

Thank you,

System Info:

Lightroom Classic version: 13.2 [ 202402141005-bf1aeb84 ]

License: Creative Cloud

Language setting: en

Operating system: Windows 11 - Home Premium Edition

Version: 11.0.22631

Application architecture: x64

System architecture: x64

Logical processor count: 20

Processor speed: 3.6GHz

SqLite Version: 3.36.0

CPU Utilisation: 0.0%

Built-in memory: 32668.0 MB

Dedicated GPU memory used by Lightroom: 1074.4MB / 8006.0MB (13%)

Real memory available to Lightroom: 32668.0 MB

Real memory used by Lightroom: 1461.2 MB (4.4%)

Virtual memory used by Lightroom: 3035.0 MB

GDI objects count: 896

USER objects count: 2446

Process handles count: 2276

Memory cache size: 30.6MB

Internal Camera Raw version: 16.2 [ 1763 ]

Maximum thread count used by Camera Raw: 5

Camera Raw SIMD optimization: SSE2,AVX,AVX2

Camera Raw virtual memory: 653MB / 16334MB (3%)

Camera Raw real memory: 725MB / 32668MB (2%)

Cache1: 

Preview1- RAM:23.0MB, VRAM:195.0MB, 000_3203.NEF

Preview2- RAM:22.0MB, VRAM:0.0MB, 000_3207.NEF

NT- RAM:45.0MB, VRAM:195.0MB, Combined:240.0MB

Cache2: 

final1- RAM:298.0MB, VRAM:0.0MB, 000_3207.NEF

final2- RAM:302.0MB, VRAM:87.0MB, 000_3203.NEF

T- RAM:600.0MB, VRAM:87.0MB, Combined:687.0MB

Cache3: 

m:30.6MB, n:75.3MB

U-main: 97.0MB

System DPI setting: 96 DPI

Desktop composition enabled: Yes

Standard Preview Size: 2560 pixels

Displays: 1) 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 2060 SUPER (31.0.15.5212)

Init State: GPU for Export supported by default

User Preference: GPU for Image Processing Enabled

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

Library Path: C:\Users\frank\Pictures\Lightroom\Lightroom Catalog-v13.lrcat

Settings Folder: C:\Users\frank\AppData\Roaming\Adobe\Lightroom

Installed Plugins: 

1) AdobeStock

2) Flickr

3) Luminar Neo

4) Nikon Tether Plugin

5) ON1 Photo RAW 2023

6) Topaz Photo AI

Config.lua flags: None

Adapter #1: Vendor : 10de

Device : 1f06

Subsystem : 3ff11458

Revision : a1

Video Memory : 8006

Adapter #2: Vendor : 1414

Device : 8c

Subsystem : 0

Revision : 0

Video Memory : 0

AudioDeviceIOBlockSize: 1024

AudioDeviceName: $$$/dvaaudiodevice/SystemDefaultAndEffectiveDeviceName=System Default - Analogue 1/2 (Audient iD14)#{comment}DVAAU-4201250: Open the audio hardware preferences page.

AudioDeviceNumberOfChannels: 2

AudioDeviceSampleRate: 48000

Build: LR5x120

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 2060 SUPER/PCIe/SSE2

GL_SHADING_LANGUAGE_VERSION: 4.60 NVIDIA

GL_STENCIL_BITS: 8

GL_VENDOR: NVIDIA Corporation

GL_VERSION: 4.6.0 NVIDIA 552.12

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 GL_ARB_explicit_attrib_location GL_ARB_explicit_uniform_location GL_ARB_fragment_coord_conventions GL_ARB_fragment_layer_viewport GL_ARB_fragment_program GL_ARB_fragment_program_shadow GL_ARB_fragment_shader GL_ARB_fragment_shader_interlock GL_ARB_framebuffer_no_attachments GL_ARB_framebuffer_object GL_ARB_framebuffer_sRGB GL_ARB_geometry_shader4 GL_ARB_get_program_binary GL_ARB_get_texture_sub_image GL_ARB_gl_spirv GL_ARB_gpu_shader5 GL_ARB_gpu_shader_fp64 GL_ARB_gpu_shader_int64 GL_ARB_half_float_pixel GL_ARB_half_float_vertex GL_ARB_imaging GL_ARB_indirect_parameters GL_ARB_instanced_arrays GL_ARB_internalformat_query GL_ARB_internalformat_query2 GL_ARB_invalidate_subdata GL_ARB_map_buffer_alignment GL_ARB_map_buffer_range GL_ARB_multi_bind GL_ARB_multi_draw_indirect GL_ARB_multisample GL_ARB_multitexture GL_ARB_occlusion_query GL_ARB_occlusion_query2 GL_ARB_parallel_shader_compile GL_ARB_pipeline_statistics_query GL_ARB_pixel_buffer_object GL_ARB_point_parameters 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[GoldingD]

First up an observation.Unfortunately this is probably not the cause or solution to your odd issue. But it does effect performance in the Develop Module. You have the default value of 5 GB for Camera RAW CACHE. Way too small. Adobe and many recommend increasing that to at least 20GB.

Second an inquiry, does this odd behavior also occur in Library Module in Loupe view?

Third, a common diagnostic is to turn off Use Graphics Processor, typically to see if the GPU driver is an issue, I suspect not. But perhaps give that a look.

Final, at least two postings with similar issue, flickering in Develop, were solved by resetting the preference file. Perhaps consider trying that.

As to resetting the preference file, carefully read:

• https://helpx.adobe.com/lightroom-classic/help/setting-preferences-lightroom.html
• https://www.lightroomqueen.com/how-do-i-reset-lightrooms-preferences/

[Aleke]

Hi @dirkr30048664. Sorry to hear you're running into issues with Lightroom Classic.

When you get a chance, could you share your System Info with us? You can find it by going to Help > System Info in Lightroom Classic. Just copy the info into a text file and attach it here, or feel free to share it via Google Drive, WeTransfer, or any other file-sharing service you prefer.

Thanks so much!
Alek

[dirkr30048664]

Hi Aleke! @Aleke

Thanks for contacting me!

I made a screen video to show what I mean. Please see this video on my webspace:
https://data.rotermundt.com/screenvideo.mp4

This is far away from being smooth.

Working on photos is fast, that's not the problem. But the if I change the size of the LR window it's quite slow as before on my old hardware.

This is the System Info that is displayed in LR:

Lightroom Classic-Version: 14.4 [ 202506051112-5918896a ]
Lizenz: Creative Cloud
Spracheinstellung: de
Betriebssystem: Windows 11 - Business Edition
Version: 11.0.22631
Anwendungsarchitektur: x64
Systemarchitektur: x64
Anzahl logischer Prozessoren: 32
Prozessorgeschwindigkeit: 4,3GHz
SQLite-Version: 3.36.0
CPU-Auslastung: 0,0%
Stromquelle: Angeschlossen
Integrierter Speicher: 95892,2 MB
Dedizierter GPU-Speicher, der von Lightroom verwendet wird: 5741,3MB / 11855,0MB (48%)
Für Lightroom verfügbarer phys. Speicher: 95892,2 MB
Von Lightroom verwendeter phys. Speicher: 3078,3 MB (3,2%)
Von Lightroom verwendeter virtueller Speicher: 10850,6 MB
Anzahl GDI-Objekte: 854
Anzahl BENUTZER-Objekte: 2545
Anzahl Prozess-Handles: 2765
Cache-Speichergröße: 399,0MB
Interne Camera Raw-Version: 17.4 [ 2272 ]
Maximale Anzahl Threads, die Camera Raw verwendet: 5
Camera Raw SIMD-Optimierung: SSE2,AVX,AVX2
Virtueller Speicher in Camera Raw: 1017MB / 47946MB (2%)
Physischer Speicher in Camera Raw: 1940MB / 95892MB (2%)

Cache1:
Final1- RAM:451,0MB, VRAM:3604,0MB, MK4_0709.CR2
NT- RAM:451,0MB, VRAM:3604,0MB, Combined:4055,0MB

Cache2:
m:399,0MB, n:247,6MB

U-main: 116,0MB

DPI-Einstellung des Systems: 144 DPI (High-DPI-Modus)
Desktop-Komposition aktiviert: Ja
Standardvorschaugröße: 3840 Pixel
Monitore/Anzeigegeräte: 1) 3840x2160
Eingabetypen: Multitouch: Nein, integrierte Toucheingabe: Nein, integrierter Stift: Nein, externe Toucheingabe: Nein, externer Stift: Nein, Tastatur: Nein

Informationen zum Grafikprozessor:
DirectX: NVIDIA GeForce RTX 5070 (32.0.15.7680)
Anfangsstatus: GPU zum Exportieren wird standardmäßig unterstützt
Benutzerpräferenz: GPU zum Exportieren aktiviert
HDR in Bibliothek aktivieren: AUS

It would be very interesting for me if you could help me in this case.

Thanks in advance!

Have a great day,

Dirk

[Aleke]

Hi @dirkr30048664! Thanks a lot for sharing your System Info and the screen recording, that really helped me understand what you’re seeing.

I was able to reproduce the issue on my end too. When you get a chance, could you try going to Edit > Preferences > Performance, then set Use Graphics Processor to Off, and see if the issue still happens?

Appreciate your help with this!

Alek

[dirkr30048664]

Hi @Aleke!

Thanks for reproducing this issue. 

I have switched off GPU support. The result was that changing the size of the LR windows is much slower, but the rebuilding of the image within LR is smoother. Unfortunately this isn't a useful solution, because everything is much slower.

I use the Nvidia Studio driver. Maybe it would be interesting to check this issue using the Nvidia Game Ready driver? What do you think?

Do you have any other idea what could cause this issue?

Have a great evening (I think you're based in the US).

Best regards,
Dirk

[Aleke]

Hi @dirkr30048664, @Frank Biganski, and anyone else experiencing this!

I’ve passed this issue along to the Lightroom Classic dev team, and they confirmed it’s a known issue related to how drawing works in Windows. It’s tied to the Windows framework that Lightroom Classic uses, which isn’t very GPU-efficient. It’s not a hardware performance issue, so upgrading your system likely won’t make a difference (even though it might seem like it should).

As a temporary workaround, you can try turning off “Use Graphics Processor” under Edit > Preferences > Performance. Just a heads-up though, this might impact performance in other parts of the app, so we understand it’s not a perfect fix.

The team is actively looking into this. If anyone else is affected, feel free to chime in on this thread. It really helps us gauge how widespread the issue is and prioritize accordingly.

Thanks so much!
Alek

[dirkr30048664]

@Aleke: Thank you very much for your help and forwardig this issue to the Adobe dev team!

Unfortunately the sp called work around isn't any solution for it. So let's hope that the dev team will find a solution and provide it with an update in the future.

This issue reminds me on former times. When developers started programming GUIs using Java about 20 or 25 years ago, the difference in the speed of GUIs were similar to GUIs programmed in C++. 😉

It would be great I you would provide me with an update if you'll get any news in regards to this issue from the dev team.

Best regards,
Dirk

[dbfoto]

I am also experiencing a crazy noticeable slowdown of LR Classic on my i9 64gb ram Nvidia GeForce RTX 4070. Switching tools within develop module almost seems to cause a hang where it appears like LR almost has to reload the whole develop module over again each time...

[ZR2A]

As a plugin dev I've seen this quite a bit and of course we get blamed for it. It not only happens as you quote but in other areas as well, most noticably when ALT-TAB to access other windows. The windows jump around and aren't selectable unless clicked on. It is worse when batch processing images in any manner.
GPU toggle isn't a valid option either due to the nature of the LR beast....it's yet another upgrade issue based on code degradation creep dumped on the masses to make the marketers and bean counters happy.

[Frank Biganski]

Hi.  Just curious why ZR2A's reply to this post has been marked as "1 Correct answer"? 

The reply does not fix anything so could this be explained to me please.

Thanks,

Frank

[ZR2A]

Frank, doesn't make any sense to me either...maybe because I'm a dev somebody used that as a selection criteria. Nonetheless adobe did acknowledge it finally after ignoring it for a long while.