Select photo takes more than 5 seconds to show image

Yes……after few hours, all the reply appears……-___-|||

driver E just a normal mechanical hard drive， 1T capacity and 463G is free. SATA connect to the motherboard. 

I do not think the catalog is the problem, since  if I create a new catalog in driver E and add photos in local driver E, the photo navigation is normal. 

Then I do more investigation, create a new catalog with 300+ photos on network driver. It works well. So network driver is not the reason.

The catalog with issue, there are 14293 photos in it. All these photos are on network driver. And this is not my biggest catalog. I create catalog by years. I did not upgrade other catalogs to 12 yet. 

Then I try to optimize catalog, it take more than 30 min and still ongoing.  I will update the results later after it finished.

Yes, I know that, catalog cannot be placed in a netwokr driver.

My catalog is in my local disk dirver.

Before LRC12, catalog in local, photos in network driver works, maybe slow but not so slow.

And, the main menu is slow response, this is weird. Even if the photos in a very slow network, why the menu is slow response?

And issue2, "Delete All Masks" does not work.

Thanks

following are the system info

Lightroom Classic version: 12.0 [ 202210031128-9cb7185d ]
License: Creative Cloud
Language setting: en
Operating system: Windows 10
Version: 10.0.19044
Application architecture: x64
System architecture: x64
Logical processor count: 6
Processor speed: 3.0GHz
SqLite Version: 3.36.0
CPU Utilisation: 3.0%
Built-in memory: 16312.8 MB
Dedicated GPU memory used by Lightroom: 3778.5MB / 8011.0MB (47%)
Real memory available to Lightroom: 16312.8 MB
Real memory used by Lightroom: 2280.4 MB (13.9%)
Virtual memory used by Lightroom: 6617.6 MB
GDI objects count: 826
USER objects count: 2656
Process handles count: 3105
Memory cache size: 40.6MB
Internal Camera Raw version: 15.0 [ 1261 ]
Maximum thread count used by Camera Raw: 4
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 799MB / 8156MB (9%)
Camera Raw real memory: 805MB / 16312MB (4%)
System DPI setting: 192 DPI (high DPI mode)
Desktop composition enabled: Yes
Standard Preview Size: 3840 pixels
Displays: 1) 3840x2160, 2) 1360x768
Input types: Multitouch: No, Integrated touch: No, Integrated pen: No, External touch: No, External pen: Yes, Keyboard: No

Graphics Processor Info: 
DirectX: NVIDIA GeForce RTX 2070 SUPER (31.0.15.1740)
Init State: GPU for Export supported by default
User Preference: Auto

Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic
Library Path: E:\SYNC\Catalog\2022\2022-v12.lrcat
Settings Folder: C:\Users\flep\AppData\Roaming\Adobe\Lightroom

Installed Plugins: 
1) AdobeStock
2) Flickr
3) LRT Export 6
4) Nikon Tether Plugin

Config.lua flags: None

Adapter #1: Vendor : 10de
	Device : 1e84
	Subsystem : 150a7377
	Revision : a1
	Video Memory : 8011
Adapter #2: Vendor : 1414
	Device : 8c
	Subsystem : 0
	Revision : 0
	Video Memory : 0
AudioDeviceIOBlockSize: 1024
AudioDeviceName: $$$/dvaaudiodevice/SystemDefaultAndEffectiveDeviceName=System Default - 扬声器 (2- High Definition Audio Device)#{comment}DVAAU-4201250: Open the audio hardware preferences page.
AudioDeviceNumberOfChannels: 2
AudioDeviceSampleRate: 48000
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 RTX 2070 SUPER/PCIe/SSE2
GL_SHADING_LANGUAGE_VERSION: 4.60 NVIDIA
GL_STENCIL_BITS: 8
GL_VENDOR: NVIDIA Corporation
GL_VERSION: 4.6.0 NVIDIA 517.40
GPUDeviceEnabled: false
OGLEnabled: true
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But with LRC11, it works well with the network driver. (Maybe also slow, but not so slow)

In developt module, it should show the preview of the photo first, and "loading" is ongoing. 

Now with LRC12, develop module, it take more than 5s to show the preview, then "loading" is ongoing. 

Actualy, my network is a 1000M local area network. I am not sure if I upgrade to 10G network will help this issue.