Latest versions of lightroom are very very slow reading xmp metadata

[JulieEdwards]

In grid view, selecting multiple photos (maybe over 50) and using "Read Metadata from Files" is magnitudes slower than previous releases.

(Writing metadata is very fast)

During the process - if running only lightroom - system memory is hogged (16GB system running down to 19/20 MB) In previous releases (pre 11) this was not an issue. I have been working , editing metadata outside LR this way for many years.

Current preferences:
Save XMP as changes made disabed.
Write metadata to JPG/TIF/PSD etc enabled
Mac system. Macbook Pr. OS Montery - fully updated. 4K HDR monitor. Data sored on fast thunderbolt drives.

metadata is being written form photomechanic.

[JulieEdwards]

Additionally - trying to view / edit the meta data panel of any other photo while this process is running is impossible. Keywords pane just displays "working"

[johnrellis]

Which version of LR are you running?  (Do Help > System Info.)

[JulieEdwards]

Lightroom Classic version: 11.3 [ 202204051513-7a25c809 ]
License: Creative Cloud
Language setting: en-GB
Operating system: Mac OS 12
Version: 12.3.1 [21E258]
Application architecture: x64
Logical processor count: 8
Processor speed: 2.8GHz
SqLite Version: 3.36.0
Built-in memory: 16,384.0 MB
Real memory available to Lightroom: 16,384.0 MB
Real memory used by Lightroom: 1,991.8 MB (12.1%)
Virtual memory used by Lightroom: 75,177.5 MB
Memory cache size: 156.5MB
Internal Camera Raw version: 14.3 [ 1072 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 0MB / 8191MB (0%)
Camera Raw real memory: 1MB / 16384MB (0%)
Displays: 1) 3840x2160

Graphics Processor Info:
Metal: AMD Radeon Pro 555

[tristans73977809]

I'm having a similar issue: takes more than one hour to read XMP data from 143 photos and 3 minutes to open an image in an external editor (Edit in ...) for exporting the file, then it takes about 30 seconds to star the image. During that time, the CPU load is 100% and the computer fans get to maximum speed. This started with the release of Lightroom Classic 11.3. System info below; currently it's unusable.

Lightroom Classic version: 11.3 [ 202204051513-7a25c809 ]
License: Creative Cloud
Language setting: en-LU
Operating system: Mac OS 12
Version: 12.3.1 [21E258]
Application architecture: x64
Logical processor count: 16
Processor speed: 2.3GHz
SqLite Version: 3.36.0
Built-in memory: 32,768.0 MB
Real memory available to Lightroom: 32,768.0 MB
Real memory used by Lightroom: 14,208.8 MB (43.3%)
Virtual memory used by Lightroom: 87,734.6 MB
Memory cache size: 2,360.8MB
Internal Camera Raw version: 14.3 [ 1072 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 704MB / 16383MB (4%)
Camera Raw real memory: 715MB / 32768MB (2%)
Displays: 1) 3584x2240

Graphics Processor Info:
Metal: AMD Radeon Pro 5500M

Application folder: /Applications/Adobe Lightroom Classic
Library Path: /Users/kewl/Pictures/Lightroom/Lightroom Catalog/Lightroom Catalog.lrcat
Settings Folder: /Users/kewl/Library/Application Support/Adobe/Lightroom

Installed Plugins:
1) AdobeStock
2) Aurora HDR 2019
3) DxO PhotoLab 2
4) DxO PhotoLab 2 Importer
5) Export to Autopano Giga 4.2
6) Facebook
7) Flickr
8) HDR Efex Pro 2
9) LRT Export 4
10) Luminar 4
11) Luminar AI
12) Luminar Neo
13) Nikon Tether Plugin

Config.lua flags: None