Issue Description:
Lightroom Classic has become extremely slow when switching into the Book Module. Whenever I switch from Library or Develop back into Book, Lightroom displays “Collecting Information…” in the upper-left corner and then hangs for a long time before the Book Module becomes usable. This behavior makes the Book Module almost unusable for book projects and did not occur before recent versions.
What I Have Already Tried:
Updated Lightroom Classic to 15.0.1
Quit + restarted Lightroom and macOS
Optimized catalog
Paused cloud sync
Verified there are no active sync operations
Issue persists regardless of whether the Book module was edited recently
Other Details:
Catalog size: 1.24 GB
Total photos: 99,136
Sync status: Sync is paused
Storage locations:
~75,000 photos stored on an external hard drive
~24,000 photos stored on the internal MacBook SSD
Catalog and previews are stored on the MacBook internal drive
Product: Lightroom Classic v15.0.1
Operating System: macOS Sequoia 15.6.1
Hardware: MacBook Pro with Apple M1 Pro chip, 16GB RAM
AdChoices