Lightroom Classic not using GPU for processing and also not saturating CPU

[GUGU_HW]

I'm using a powerful Epyc 9575F+RTX5090 workstation, but I find that Lightroom classic's performance is way underwhelming. The example is doing a batch enhance detail for 500 images. This is AI based so it should run under GPU and yes it run under GPU on my old computer and Mac. But I find that in here it runs on CPU, and more disappointingly not fully saturating the CPU. I enabled CCD as virtual NUMA node so task manager will show 8 graphs, and each graph present 8 cores. You can see that only one CCD is used (likely to because of Windows's scheduler trying to bin on one NUMA node aka CCD, which is the reason of enabling virtual NUMA to enhance L3 cache hitrate), and only half is saturated. There's VRAM allocated but GPU not computing. Except for AI functionality speed the overall performance is even worse than my M4 Pro, which is so disappointing. The system information also shows only 6 maximum camera raw threads. Full GPU acceleration is manually enabled and system information proving this with DirectX engine. However in indexing after import, the CPU can be fully saturated, every CCD work and will saturate the whole CPU to about 80%, which is good. Also, in saving XMP and exporting, it's also the same sense. Very slow and only CPU ultulization. It even seems to be serial, not parallel at all. I think this is a bug, does anyone have any idea why and how to solve it?

 

 

[johnrellis]

Please do the LR menu command Help > System Info and copy/paste the entire contents here so we can see exactly which versions of hardware and software LR thinks you're running and important LR options that are set.

[GUGU_HW]

Lightroom Classic version: 14.5.1 [ 202508231203-c2638d01 ]
License: Creative Cloud
Language setting: en
Operating system: Windows 11
Version: 11.0.26100
Application architecture: x64
System architecture: x64
Logical processor count: 64
Processor speed: 3.3GHz
SqLite Version: 3.36.0
CPU Utilisation: 1.0%
Power Source: Plugged In
Built-in memory: 589290.2 MB
Dedicated GPU memory used by Lightroom: 196.4MB / 32100.0MB (0%)
Real memory available to Lightroom: 589290.2 MB
Real memory used by Lightroom: 6122.2 MB (1.0%)
Virtual memory used by Lightroom: 7077.8 MB
GDI objects count: 892
USER objects count: 3037
Process handles count: 3160
Memory cache size: 1026.8MB
Internal Camera Raw version: 17.5 [ 2318 ]
Maximum thread count used by Camera Raw: 9
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 430MB / 294645MB (0%)
Camera Raw real memory: 495MB / 589290MB (0%)

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

Cache2:
m:1026.8MB, n:0.0MB

U-main: 86.0MB

System DPI setting: 168 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: NVIDIA GeForce RTX 5090 (32.0.15.8097)
Init State: GPU for Export supported by default
User Preference: GPU for Image Processing Enabled
Enable HDR in Library: ON
GPU for Preview Generation: On (S5_31)

Application folder: E:\Program Files\Adobe\Adobe Lightroom Classic
Library Path: P:\Lightroom\Lightroom Catalog-v13-3.lrcat
Settings Folder: C:\Users\GUGU\AppData\Roaming\Adobe\Lightroom

Installed Plugins:
1) AdobeStock
2) DxO PureRAW 5
3) DxO PureRAW 5 Importer
4) Flickr
5) LRT Export 7

Config.lua flags:

Adapter #1: Vendor : 10de
Device : 2b85
Subsystem : 205710de
Revision : a1
Video Memory : 32100
Adapter #2: Vendor : 1414
Device : 8c
Subsystem : 0
Revision : 0
Video Memory : 0
Adapter #3: Vendor : 1414
Device : 8c
Subsystem : 0
Revision : 0
Video Memory : 0
AudioDeviceIOBlockSize: 1024
AudioDeviceName: System Default - PHL 27E1N8900 (NVIDIA High Definition 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 5090/PCIe/SSE2
GL_SHADING_LANGUAGE_VERSION: 4.60 NVIDIA
GL_STENCIL_BITS: 8
GL_VENDOR: NVIDIA Corporation
GL_VERSION: 4.6.0 NVIDIA 580.97
GPUDeviceEnabled: false
OGLEnabled: true
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[johnrellis]

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

"Init State: GPU for Export supported by default
User Preference: GPU for Image Processing Enabled"

You've got Use GPU For Export unchecked, so LR won't use the GPU for exporting:

[Jao vdL]

There is also this notice in the lower section: 

GPUDeviceEnabled: false

It looks like the GPU is getting disabled more deeply somehow. 

[GUGU_HW]

Thank you so much for pointing out that. I think it may shadows a bug or something. If you have any disagnose ways, I'm very happy to participate.

[GUGU_HW]

Sorry I have to change language to get an english system info dump. and i don't know why after changing language, gpu export is disabled. But I'm sure I previously work on GPU full acceleration enabled, and you can see that it does not only alter export, also processing. Another friend just said that GPU is automatically disabled by the engine although shows to be enabled, I think that MAY be the bug? I just checked again, with sure that GPU is fully enabled, both by hand or by auto, the problem still exists, GPU engine never ultilized with only VRAM allocation, and even CPU can't be fully ultilized, making it very slow.

[Jao vdL]

I don't have a similar machine to compare so not sure but that line does worry me that indeed the GPU is not playing at all consistent with your observations. This machine should be at least as fast as that M4 Pro you compare to. I would reinstall the GPU driver and disable any custom settings on the GPU you might have done. Make sure you use the studio driver from NVidia and not the gaming one. From the system listing above you probably have the very latest version installed but good to check.

[johnrellis]

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Normally, when the Camera Raw engine embedded in LR thinks the GPU is operating normally, it displays this:

But when Camera Raw detects a problem with the GPU, it will temporarily disable it and display this message:

What do you see in your Preferences > Performance?

[GUGU_HW]

I tried fresh reinstalling latest studio driver, then open lightroom classic. Now upon first run, I immediately checked system info, it says that full graphics acceleration is autiomatically enabled (I currently put GPU to auto mode), but in the info log, it still says "GPUDeviceEnabled: false" in the same place. I tried exporting 700 raws to jpg for a test. I find that lightroom or internal camera raw allocated huge amount of VRAM, making my system's VRAM usage to 26G (lightroom is the only gpu heavy app that i run). The GPU usage is strange. It only ultilizes Graphics_1 engine and on very light load. The load pattern is similar to the image below, only engine differs, the same small spikes. I also tried batch doing SR to 250 images, which is a real GPU heavy work. when doing this, the system's VRAM usage is 13.4G, and GPU is also in very light load, while CPU in heavy load but constrained to maybe the camera raw max thread count. CPU's load is definitely heavier than the GPU. GPU has load only on Compute_1 engine not 3D, and very light, only 100w power draw, like this:

I tried to store the images (and also the lightroom binary) on a very fast disk (optane), so disk must not be the limitation. After all these tests, the preferences still not say GPU error so disabled (I occurred it on my old computer, so I know it will prompt a window saying GPU acceleration is disabled until next launch etc.), and also the system information still saying the same "GPUDeviceEnabled: false"

[johnrellis]

"but in the info log, it still says "GPUDeviceEnabled: false" in the same place."

Try this procedure:

1. Exit LR.

2. In Windows File Explorer, copy and paste this line into the address bar:

%APPDATA%\Adobe\CameraRaw\GPU

3. Rename the subfolder "Adobe Photoshop Lightroom Classic" to "Adobe Photoshop Lightroom Classic.old".

4. Restart LR. The Camera Raw engine will reevaluate the GPU's capabilities, hopefully recognizing the presence of the GPU now. This is sometimes required when you change hardware or driver configurations.

[GUGU_HW]

I have done these procedures. Now after lightroom starts, a new "Adobe Photoshop Lightroom Classic" folder is created beside the renamed folder. However, nothing changes.

[johnrellis]

"after lightroom starts, a new "Adobe Photoshop Lightroom Classic" folder is created beside the renamed folder. However, nothing changes."

Inside that folder, there should be the file "Camera Raw GPU Config.txt" (normal). Do you also see the files TempDisableGPU2 or TempDisableGPU3?

[johnrellis]

Another strange thing I noticed in System Info:

Adapter #2: Vendor : 1414
Device : 8c
Subsystem : 0
Revision : 0
Video Memory : 0
Adapter #3: Vendor : 1414
Device : 8c
Subsystem : 0
Revision : 0
Video Memory : 0

The video adapter device "Vendor: 1414 / Device: 8c" is Windows' "Basic Render Driver", which provides basic graphics rendering and is present on every machine.  But you have two of them installed -- I don't know what that means or whether it's normal. 

[GUGU_HW]

This is what in the txt, no gpu disable.

<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 7.0-c000 1.000000, 0000/00/00-00:00:00        ">
 <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
  <rdf:Description rdf:about=""
    xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/"
   crs:gpu_preferred_system=""
   crs:gpu_init_digest="315BFE7B80450746E2FDC4207A2FD8ED"
   crs:gpu_compute_digest="23B9FD622B9933E0F0DF8115D285D719"
   crs:gpu_compute_quick_self_test_passed="True"
   crs:gpu_hdr_display_scale="1"/>
 </rdf:RDF>
</x:xmpmeta>

I have two gpus, one aspeed igpu from bmc, and one rtx5090. My aspeed gpu's driver is also installed, in device manager, it shows name "ASPEED Graphics Family(WDDM)", with aspeed driver 9.0.10.116. It will provide a virtual monitor for bmc vnc. However I disabled it from windows settings. In device manager, there's no microsoft basic display shown, so I don't know why lr will detect two of these. I tried to disable the aspeed gpu from device manager, and then open lr. Now there will be only one 1414:8c device, meaning that one of it is because of the aspeed igpu. However, the other one still exist, and gpuenabled is still false.

[johnrellis]

If it's possible, as an experiment try removing the Aspeed card from the computer.  Perhaps its presence is confusing Windows and/or Camera Raw.  Other than that, I'm out of ideas.

[GUGU_HW]

Sorry, the aspeed chip is integrated on the motherboard like a south bridge chip in a normal pc, so it's physically impossible to uninstall it. All I can do is to logically disable it via device manager. But why the nvidia gpu will expose two devices and one is the basic display, I don't know and am interested in that.

[johnrellis]

"GPUDeviceEnabled: false"

I think this was a red herring, and that line doesn't mean that LR isn't recognizing your GPU. 

I noticed that my own test Windows machine reports the same thing, but it fully utilizes its GPU. I searched this forum for all posts containing System Info containing that line and found over 1000:

https://community.adobe.com/t5/forums/searchpage/tab/message?sort_by=-topicPostDate&q=%22GPUDeviceEn...

I sampled about a dozen from recent posts about issues that would have nothing to do with GPU performance.

So whatever that line means, it doesn't mean that LR / CR considers the GPU unvailable.

[johnrellis]

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I also recalled a discussion here last spring, where I learned about how Task Manager reports the utilization of the GPU:

https://devblogs.microsoft.com/directx/gpus-in-the-task-manager/

It's not always intuitive. What does your Task Manager show for overall GPU utilization when doing a batch Denoise?  On my small Windows test machine, it reports 90% overall utilization (and larger) even though the graphs show the GPU as mostly idle:

[KR Seals]

What type of drive is P:? how is it connected?