Hi,
We have few questions:
Could you specify which version of Lightroom Classic are you using?
When you say large quantities of metadata, are you using a metadata preset for this? Also, how many images are you applying these at once?
Do you have automatically write metadata changes turned on? "Edit > Catalog Settings > Metadata tab > Automatically write changes to XMP"
All all the images you are adding metadata/keywords to locally present or on a external storage (hard disk, network, NAS, etc)?
Thanks,
Smit
Lightroom Classic team
Adobe
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