Lightroom Classic with Secondary Display is unusable

[crazzy88ss]

I've read a few posts but there doesn't really seem to be any consensus on how to solve this problem.  Is there just nothing that can be done to help the problem?

LR Classic is extremely laggy or fully crashes when I have the Window > Secondary Display enabled.

I have a fresly built PC in W10 with everything updated.  I run Task Manager all the time and I do not see resources being a limiting factor here.

Ryzen 7 3700x

32gb DDR4 3200

RTX 1060 6GB

Windows 10 Home

Lightroom Classic version: 9.2.1 [ 202004070813-7699d98a ]
License: Creative Cloud
Language setting: en
Operating system: Windows 10 - Home Premium Edition
Version: 10.0.19041
Application architecture: x64
System architecture: x64
Logical processor count: 16
Processor speed: 3.6 GHz
SqLite Version: 3.30.1
Built-in memory: 32716.0 MB
Real memory available to Lightroom: 32716.0 MB
Real memory used by Lightroom: 5247.1 MB (16.0%)
Virtual memory used by Lightroom: 11281.9 MB
GDI objects count: 934
USER objects count: 2935
Process handles count: 2003
Memory cache size: 103.4MB
Internal Camera Raw version: 12.2.1 [ 415 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 2022MB / 16358MB (12%)
Camera Raw real memory: 2038MB / 32716MB (6%)
System DPI setting: 96 DPI
Desktop composition enabled: Yes
Displays: 1) 1680x1050, 2) 1920x1080
Input types: Multitouch: No, Integrated touch: No, Integrated pen: No, External touch: No, External pen: No, Keyboard: No

Graphics Processor Info: 
DirectX: NVIDIA GeForce GTX 1060 6GB (26.21.14.4614)



Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic
Library Path: D:\Pictures\LightroomMasters-CurrentLibrary\Lightroom Current Catalog.lrcat
Settings Folder: C:\Users\Steph\AppData\Roaming\Adobe\Lightroom

Installed Plugins: 
1) AdobeStock
2) Facebook
3) Flickr
4) Nikon Tether Plugin

Config.lua flags: None

Adapter #1: Vendor : 10de
	Device : 1c03
	Subsystem : 11d710de
	Revision : a1
	Video Memory : 6052
Adapter #2: Vendor : 1414
	Device : 8c
	Subsystem : 0
	Revision : 0
	Video Memory : 0
AudioDeviceIOBlockSize: 1024
AudioDeviceName: Speakers (Realtek(R) Audio)
AudioDeviceNumberOfChannels: 2
AudioDeviceSampleRate: 48000
Build: 12.1x4
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: GeForce GTX 1060 6GB/PCIe/SSE2
GL_SHADING_LANGUAGE_VERSION: 4.60 NVIDIA
GL_STENCIL_BITS: 8
GL_VENDOR: NVIDIA Corporation
GL_VERSION: 4.6.0 NVIDIA 446.14
GPUDeviceEnabled: false
OGLEnabled: true

//remainder deleted

[crazzy88ss]

Can anybody help?

[dj_paige]

What actions in Lightroom Classic are you performing when this slowness/lag happens?

Which screen of your two screens is being used when this slowness/lag happens?

Graphics acceleration should be turned OFF (Preferences->Performance->"Use Graphics Processor" should be OFF)

[GoldingD]

1. How are the monitors connected

Are they connected to the one GPU (and not one to GPU, one to Video off Motherboard)

On the one GPU, the connectors, are they the same type (as in both Display Port, not one Display  Port, one HDMI)

You do not perhaps have a second descreate GPU installed perhaps, even if not in use.

[GoldingD]

Graphics Processor Info: 
DirectX: NVIDIA GeForce GTX 1060 6GB (26.21.14.4614)

v446.14, if GameReady driver, then per NVIDIA v 451.48 is available, use your NVIDIA GeForce Experiance app to fix.

[GoldingD]

Displays: 1) 1680x1050, 2) 1920x1080

So not 4K, is the /preferences/performance option Use Graphics Processor on? Sub 4K that may cause issues and not help performance. Give it a try.

[GoldingD]

As this appears to be a desktop, not a limited All in one, or a power challenged laptop or seriously under powered tablet, have you considered the following:

https://www.winhelp.info/boost-lightroom-performance-on-systems-with-nvidia-graphics-chip.html

[GoldingD]

And similarly, see tip 8 in:

https://au.pcmag.com/windows-10-1/5180/11-tips-to-speed-up-windows-10

[GoldingD]

And as NVIDIA, see 

https://www.nvidia.com/content/Control-Panel-Help/vLatest/en-us/mergedProjects/nvdsp/To_use_more_tha...

mind you, I have never gone dual display. so with a grain of salt.

[crazzy88ss]

I thought I was on the latest NVIDIA drivers when I posted this (I didn't realize they uipdate so frequently).  I updated them and it seemed to help somewhat.  

I've started using the second monitor in Grid display only.  That seems to have made the biggest improvement.

The tasks I was doing when experiencing the problems were having the second screen in "Loupe - Locked" position + a large amount of adjustment brushes to a 24mp NEF file.

[Jao vdL]

The problem with the way the secondary display works in Classic is that the display is done from jpeg previews instead of using the same engine as is used in develop for the image display. So every time you make a change to the image, it has to rerender a jpeg large enough for the secondary display resolution. This is not done using any GPU acceleration so is slow and can lag behind the main display considerably.

[crazzy88ss]

That actually makes a lot of sense.  Thanks for the insight.