• Welcome to the Lightroom Queen Forums! We're a friendly bunch, so please feel free to register and join in the conversation. If you're not familiar with forums, you'll find step by step instructions on how to post your first thread under Help at the bottom of the page. You're also welcome to download our free Lightroom Quick Start eBooks and explore our other FAQ resources.
  • Are you using the cloud-based Lightroom apps for Windows, Mac, iOS, Android, Apple TV and Web? Then you'll love my new book, Adobe Lightroom - Edit Like a Pro!

    You'll learn how to use the Lightroom cloud ecosystem to organize, edit and share your photos. You'll also come to understand the thought processes used by professional photographers when they're editing their own photos, so you can transform your photos quickly and easily. And better still, the eBooks are updated for every release, so it's always up to date.

LR Cloud slows down Mac dramatically

May 17, 2019
Lightroom Version
LR CC 4.1
Operating System
  1. macOS 11.0 Big Sur
  2. iOS
  3. Other (please note in thread)
I have a problem for quite a while with slowness of LR CC on a 2019 MacBook Pro 15”, i7, 32 GB, 2TB SSD. 500 GB of operating system, paging space, etc. the catalogue is on the SSD. I’ve done all optimization steps I could find. The memory usage is 70-100%. The CPU usage is 93%. All other windows are closed and nothing is being done. Whether LR is idling or in use, the high memory and CPI usage is the same. I have a very large catalogue. I suspect that LR is churning away at keeping that in memory. Otherwise I can’t imagine why it would be so incredibly slow. Exporting files takes forever. Memory utilization jumps to 100%. On the iPad and iPhone there is no issue with speed.
Can anyone please give advice on how to tune LR so it will speed up and not hog so much memory and CPU?
Sep 29, 2007
Isle of Wight, UK
Lightroom Experience
Power User
Lightroom Version
Cloud Service
That does sound odd. Have you tried uninstall/reinstall?