Lightroom Extremely Slow – Only App Affected

I think I found a workaround to the problem. Things get much better (almost normal speed, stable) if I do not have the Library module pointed to “All Photographs” (left column, under Catalog) and instead pointed to to the folder where I have only recent (this year’s) pictures. My catalog has over 75,000 files and I can confirm that when I point there, Lightroom slows way down. I don’t know if it is trying to create Previews in the background for all the photos, or doing some kind of indexing, or what. I do not have Face Recognition or Culling on (ever) but who knows, maybe Lightroom does something in the background to get ready for it. This could explain the abnormally high CPU and memory usage even when I’m not doing anything. I do not pretend to know what is actually going on behind the curtain, but by sticking to a small subset of the catalog, I avoid the slowdown/lagging problems that I had been experiencing since version 15 came out. YMMV.

Hi, thanks for your concern. To be clear, it’s not just one feature. Nearly everything in the module is extremely slow—menu navigation, switching photos, applying presets, using masks—basically the entire workflow is laggy. As i mention before, just to open “Preferences” took me about 15 seconds to show up the pop up.

Hi, thanks for replying. The catalog is relative small and i did create several new catalogs, every one with the same slow workflow. Even open the menu Edtit → Preferences took me about 15 seconds to show up.
Here’s the copied text:

“Lightroom Classic version: 15.2.1 [ 202603161217-0bf813d9 ]
License: Creative Cloud
Language setting: en
Operating system: Windows 11 - Business Edition
Version: 11.0.26200
Application architecture: x64
System architecture: x64
Logical processor count: 8
Processor speed: 3,6GHz
SqLite Version: 3.36.0
Adobe GSDK Version: 1.4.0.212

CPU Utilisation: 4,0%
Power Source: Plugged In
Built-in memory: 32702,4 MB
Dedicated GPU memory used by Lightroom: 2590,8MB / 8170,9MB (31%)
Real memory available to Lightroom: 32702,4 MB
Real memory used by Lightroom: 2074,3 MB (6,3%)
Virtual memory used by Lightroom: 5156,7 MB
GDI objects count: 823
USER objects count: 2739
Process handles count: 3269
Memory cache size: 1032,2MB
Internal Camera Raw version: 18.2.2 [ 2512 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 552MB / 16351MB (3%)
Camera Raw real memory: 637MB / 32702MB (1%)

Cache1: 
Final1- RAM:254,0MB, VRAM:791,0MB, DSC01468.ARW
Final2- RAM:152,0MB, VRAM:592,0MB, teste aurora-4_80RHlf.jpg
NT- RAM:406,0MB, VRAM:1383,0MB, Combined:1789,0MB

Cache2: 
m:1032,2MB, n:245,9MB

U-main: 154,0MB

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: No, External touch: No, External pen: No, Keyboard: No

Graphics Processor Info: 
DirectX: Radeon RX 580 Series (31.0.21924.61)
Init State: GPU for Export supported by default
User Preference: Auto
Enable HDR in Library: OFF
GPU for Preview Generation: On (S5_7)

Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic
Library Path: C:\Users\Itsari\Pictures\Global\Global - Évora\Global - Évora.lrcat
Settings Folder: C:\Users\Itsari\AppData\Roaming\Adobe\Lightroom

Installed Plugins: 
1) AdobeStock
2) Flickr

Config.lua flags: 

Adapter #1: Vendor : 1002
    Device : 67df
    Subsystem : 34181462
    Revision : e7
    Video Memory : 8170
Adapter #2: Vendor : 1414
    Device : 8c
    Subsystem : 0
    Revision : 0
    Video Memory : 0
AudioDeviceIOBlockSize: 1024
AudioDeviceName: System Default - Altifalantes (Realtek High Definition Audio)
AudioDeviceNumberOfChannels: 2
AudioDeviceSampleRate: 48000
Build: LR5x34
Direct2DEnabled: false
GL_ACCUM_ALPHA_BITS: 8
GL_ACCUM_BLUE_BITS: 8
GL_ACCUM_GREEN_BITS: 8
GL_ACCUM_RED_BITS: 8
GL_ALPHA_BITS: 8
GL_BLUE_BITS: 8
GL_DEPTH_BITS: 32
GL_GREEN_BITS: 8
GL_MAX_3D_TEXTURE_SIZE: 2048
GL_MAX_TEXTURE_SIZE: 16384
GL_MAX_TEXTURE_UNITS: 8
GL_MAX_VIEWPORT_DIMS: 16384,16384
GL_RED_BITS: 8
GL_RENDERER: Radeon RX 580 Series
GL_SHADING_LANGUAGE_VERSION: 4.60
GL_STENCIL_BITS: 8
GL_VENDOR: ATI Technologies Inc.
GL_VERSION: 4.6.0 Compatibility Profile Context 26.1.1.251211
GPUDeviceEnabled: false
OGLEnabled: true
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Hi, thanks for replying. I have 928GB free on the SSD and 2,7TB on the hardisk. 32GB ram and and Radeon RX 580 8gb dedidaded graphic card. I work on a PC and edit 4k videos on PR with no perfomance issues. PS and Ai run smooth. Only LR has this issue.