Performance issues in LRC 13.3

Question

Since the update to LRC 13.3, I am facing various performance issues (slow response time in Library as well as in Develop modules) and I believe that I have discovered steps which might lead to this issue:

Whenever I add a large photo (big DNG file rcreated by AI Denoise or a Photoshop document) to a synced collection, it is seemingly synchronized with the cloud very fast and also the cloud icon in the upper right corner of the Lightroom UI suggests that everything is synced. I would expect normal performance as nothing suggests any activity.

However, when I look at the system activity monitor I can see that Lightroom keeps using a lot of CPU for several minutes and its responsivenes steeply decreeses even for basic actions (e.g. changing the star rating, collapsing stack or similar). The issue disappears after couple of minutes and everything is back to normal until I add another photo to a synced collection. My assumption is that this might be caused by some heavy processing on background related to the cloud syncing but this is not visible anywhere in the UI.

I am using Mac Studio with 32 GB RAM, M2 Max CPU and macOS v 14.5 and I did not see this issue in LRC 13.2.

libork29572692 · Answer

Thank you very much for your reply. I am aware of the article on lightroomqueen.com and it helped me in resolving some sync issues that appeared immediately after my catalog migration after the update to 13.3.

However, this is not the case I was describing in my post. I will try to describe the steps which allow me to replicate the issue:

1. Go to a synced collection and select a raw file.

2. Go to Develop module, then to Detail, click Denoise and then Enhance.

3. After short time (typically 8-10 sec), an enhanced version of the file is created and stacked with the original raw file and put in the same collection as the original photo.

4. The cloud icon in the top right corner indicates that the newly created enhanced file is being synchronized with cloud. This lasts for several seconds.

5. Lightroom gets unresponsive for approximately 2,5 minutes. I can switch from Develop to Library module, but this is pretty much everything I can do. During that time, Lightroom is consuming 100% CPU according to the activity monitor, but nothing in Lightroom UI would suggest that it is busy or what is it doing. There are no sync issues reported on web.

6. After approx 2. minutes, the CPU %of Lightroom returns to normal (around 5% CPU) and Lightroom behaves normally.

Note: I have GPU acceleration enabled but the GPU percentage remains very low. I tried various settings of the GPU acceleration but it does not influence the described behaviour.

I hope someone could let me know if they can replicate the issue with the steps described above or if it is just me...

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