Dehaze in LR Classic 12.1 has severe performance degradation compared to 12.0.1.

[johnm59973136]

With version 12.0.1 moving the Dehaze slider reacts virtually instaneously. With version 12.1 there is a many seconds lag for each slider change. It makes using Dehaze very difficult.  I have switched between 12.0.1 and 12.1 multiple times and this performance problem is consistent. I've currently downgraded to 12.0.1.

I use LR for large images (~40MB) from a Nikon Z9. I have a 3.6ghz 12 core Intel I7 with 32GB Ram and SSD disks. I have the latest video drivers for my card (GeForce 1030). 

My desktop configuration:

Lightroom Classic version: 12.0.1 [ 202210260744-9e008017 ]
License: Creative Cloud
Language setting: en
Operating system: Windows 10 - Business Edition
Version: 10.0.22000
Application architecture: x64
System architecture: x64
Logical processor count: 20
Processor speed: 3.6GHz
SqLite Version: 3.36.0
CPU Utilisation: 1.0%
Built-in memory: 32577.7 MB
Dedicated GPU memory used by Lightroom: 1160.4MB / 1981.1MB (58%)
Real memory available to Lightroom: 32577.7 MB
Real memory used by Lightroom: 3328.7 MB (10.2%)
Virtual memory used by Lightroom: 4876.6 MB
GDI objects count: 769
USER objects count: 2633
Process handles count: 6708
Memory cache size: 62.2MB
Internal Camera Raw version: 15.0 [ 1261 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 870MB / 16288MB (5%)
Camera Raw real memory: 959MB / 32577MB (2%)
System DPI setting: 168 DPI (high DPI mode)
Desktop composition enabled: Yes
Standard Preview Size: 1440 pixels
Displays: 1) 1920x1080, 2) 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 GT 1030 (31.0.15.2824)
Init State: GPU for Image Processing supported by default with custom export support
User Preference: GPU for Image Processing Enabled

Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic
Library Path: J:\Lightroom\MainCatalog\catalog\catalog-2-2-v12.lrcat
Settings Folder: C:\Users\john\AppData\Roaming\Adobe\Lightroom

Installed Plugins:
1) AdobeStock
2) Flickr
3) Nikon Tether Plugin
4) Topaz Photo AI

Config.lua flags: None

Adapter #1: Vendor : 10de
Device : 1d01
Subsystem : 63353842
Revision : a1
Video Memory : 1981
Adapter #2: Vendor : 1414
Device : 8c
Subsystem : 0
Revision : 0
Video Memory : 0
AudioDeviceIOBlockSize: 1024
AudioDeviceName: $$$/dvaaudiodevice/SystemDefaultAndEffectiveDeviceName=System Default - Speakers (2- Logitech USB Headset H340)#{comment}DVAAU-4201250: Open the audio hardware preferences page.
AudioDeviceNumberOfChannels: 2
AudioDeviceSampleRate: 44100
Build: LR5x19
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 GT 1030/PCIe/SSE2
GL_SHADING_LANGUAGE_VERSION: 4.60 NVIDIA
GL_STENCIL_BITS: 8
GL_VENDOR: NVIDIA Corporation
GL_VERSION: 4.6.0 NVIDIA 528.24
GPUDeviceEnabled: false
OGLEnabled: true
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[johnm59973136]

And no, it doesn't track one photo. Happens on all, across multiple batches.

[GoldingD]

Have you ever followed a tutorial like the one in the link below, to optimize your NVIDIA  GPU for use in LrC?

Not sure if I agree with all his changes, one would have to test.

https://www.youtube.com/watch?v=tELpPlkXlVE

I have played with a few, to see if I can foul my rig up (and see your issue) but not yet.

Usualy members who point out the NVIDIA Control panel, refer specifically to the Power Management setting.

[johnm59973136]

Thanks. I tried setting the NVidea properties as that vid suggested and it didn't improve things. So far I'm going with your earlier suggestion of changing the LRC Performance Preferences for "Use Graphics Processor = OFF". That at least makes it ususable.

I don't see anything that's so unusal about my setup. I have a great CPU and 32G of ram and a decent, though non-gaming, video card (Geforce 1030).  It's a mystery that I think only Adobe can resolve. But thanks for your help!

[GoldingD]

deleted, my bad

[GoldingD]

Probably my last attempt to help. Was searching for any article from NVIDIA on issues with LrC v12.1.Basically failed in my search, but, in another members posting showed up, and in that discussion, Rikk Flohr has a reply of interest. Mind you, why has he not brought this up in your discussion? General thought is if you upgraded to version X, it failed someway, so you rolled back to version Y, and it works, so something is wrong with version X. But what version X is fine, what if something went wrong during install?

He provides a procedure for this:

Clean Lightroom Install Procedure

1. Close Lightroom
2. Restart the computer
3. Use the Adobe Creative Cloud App to uninstall Lightroom
4. Restart the computer
5. Install Lightroom via the Creative Cloud App without launching any other programs.
6. Restart the computer
7. Launch Lightroom
8. Wait 5 minutes

source:

https://community.adobe.com/t5/lightroom-classic-discussions/lrc-version-12-1-performance-issues-usi...

the discussion listed above has not been marked as solved, his reply has not been marked as correct, it does not appear that any followup reply to his reply has occurred.

Another consideration, one that might be seen as a magic panacea, is to reset the preference file. 

Mind you, all the above might be a waste of time.

[johnm59973136]

Thanks. I had tried renaming the preferences directories prior to upgrade. That didn't help. Then I diff'ed the files in the new and old preference directories to see if there was anything obvious but the contents are so arcane I couldn't distinguish anything that might be related.
For now, I'm going with your earlier suggestion to just configure LRC so it doesn't use the GPU. It fixes the immediate problem, and do far I don't see any downside at all.
FWIW, I don't think it's cool for Adobe to whitewash these kinds of problems. If an upgrade leads to some inconsistent state that causes subsequent problems that's a serious bug in upgrade. Even if a clean install resolves it, that's not a fix. Many users still have to spend many hours thrashing around trying to determine why the product mysteriously became unusable. 
Anyhow, thanks for you help on this.

[GoldingD]

"Thanks. I had tried renaming the preferences directories prior to upgrade"

Just to be clear, resetting the preference file does not involve directories, basically it is deleting one file as to allow LrC to recreate a fresh new one upon LrC start. This preference file can get corrupted leading to odd behavior.

Following is a link on the how:

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

be warned, this can/will result in preference settings reverting to defaults.

[johnm59973136]

I believe it effectively does the same thing. If you rename the dir, LRC creates a new preferences dir when it starts up.  And this rename dir technique is what the Adobe Tech support guy did during the remote troubleshooting session.

[GoldingD]

"I believe it effectively does the same thing."

Ah, Ok, a bit overkill, but same result.

As for that Clean Install, mentioned, did you try that?

One difference in a clean install as opposed to what you probably accomplished in a reinstall, is the computer restarts in between LrC uninstall and Installs. Or did you in fact accomplish computer restarts previously?

[SeanMcCormack]

Hi John, I appreciate this is annoying for you. For Adobe to fix a bug, they need to be able to reproduce it consistently. You cannot fix a bug that you can't find. It may even be down to the combination of hardware you're using, and unless they have this exact combination in their testing arsenal, it would be hard to reproduce. @Rikk Flohr: Photography tests most of the items posted as bugs to see if it's reproducable, so I'd hardly say that it's whitewashing on Adobe's part. Usually if there's a bug that's causing issues, they'll even do a .01 release as they did in the case of 12.01. 

Your card is the minimum recommended, so I'm not surprised to hear you're not seeing much of a difference. I've just upgraded my own machine and I can definitely see it, but before, it really didn't matter. There's a time cost to moving the image from CPU to GPU and back, which even out there.