Since upgrading to version 15, it takes several minutes to open Lightroom

Hi AxelMatt,  very little running on my 28 core CPU,  CPU is less than 10%,  no lightroom errors in the event log.

Catalog is on the same SSD as the app,  but it's a new, empty catalog,  again these issues only came after I upgraded to V15

Mike

Hi Ken

This issue has only arisen since I installed v15,  absolutely no issues prior to that.

I created a new catalog and this has the same issue,  no images in it at all.  I am confident thisis not a corrupted catalog nor faulty RAM.

I also see significant lag when using subject masks,  this was never an issue before the upgrade

Mike

Thanks Mike

Lightroom Classic version: 15.0.1 [ 202511041508-dddee541 ]
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: 28
Processor speed: 2.1GHz
SqLite Version: 3.36.0
Adobe GSDK Version: 1.4.0.171

CPU Utilisation: 2.0%
Power Source: Plugged In
Built-in memory: 32536.5 MB
Dedicated GPU memory used by Lightroom: 36.3MB / 15907.0MB (0%)
Real memory available to Lightroom: 32536.5 MB
Real memory used by Lightroom: 767.1 MB (2.3%)
Virtual memory used by Lightroom: 738.0 MB
GDI objects count: 755
USER objects count: 3098
Process handles count: 2704
Memory cache size: 0.0MB
Internal Camera Raw version: 18.0 [ 2389 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 0MB / 16268MB (0%)
Camera Raw real memory: 1MB / 32536MB (0%)

Cache1:
NT- RAM:0.0MB, VRAM:0.0MB, Combined:0.0MB

Cache2:
m:0.0MB, n:0.0MB

U-main: 82.0MB

System DPI setting: 96 DPI
Desktop composition enabled: Yes
Standard Preview Size: 1920 pixels
Displays: 1) 1920x1200
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 5070 Ti (32.0.15.8180)
Init State: GPU for Export supported by default
User Preference: GPU for Export enabled
Enable HDR in Library: OFF
GPU for Preview Generation: Auto (S5_15)

Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic
Library Path: C:\Users\mike2\Pictures\test\test.lrcat
Settings Folder: C:\Users\mike2\AppData\Roaming\Adobe\Lightroom

Installed Plugins:
1) AdobeStock
2) Flickr

Config.lua flags:

Adapter #1: Vendor : 10de
Device : 2c05
Subsystem : 276519da
Revision : a1
Video Memory : 15907
Adapter #2: Vendor : 8086
Device : a780
Subsystem : d0001458
Revision : 4
Video Memory : 80
Adapter #3: 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: Uninitialized
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 5070 Ti/PCIe/SSE2
GL_SHADING_LANGUAGE_VERSION: 4.60 NVIDIA
GL_STENCIL_BITS: 8
GL_VENDOR: NVIDIA Corporation
GL_VERSION: 4.6.0 NVIDIA 581.80
GPUDeviceEnabled: false
OGLEnabled: true
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Hi,  I was prompted to do the upgrade and approved it.  It completed without error.

I have created a completely new Catalog with zero images and I have the same problem,  so this is nothing to do with catalog size or previews etc....