Lightroom Classic Start up performance.

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  • Updated 6 months ago
So when I start up Lightroom classic it takes... a long time to load the catalogue.  It's always optimised when closed but it takes about 40-45 seconds to actually load up.

Anyone know what actually affects the start up performance.

I have around 50k images in the library so I know its not smelly but I am told that's not a massive issue.  

Running on latest MacBook Pro from the internal SSD and photos are on a fast RAID. 

Any ideas please.. as it drives me nuts that it takes that long to load.
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P Green

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Posted 7 months ago

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Photo of Smit Keniya

Smit Keniya, Employee

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Hi,

Which macOS are you on?

Also, could you share how many presets do you have?

Thanks,
Smit Keniya
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P Green

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Latest MacOS and latest Lightroom .. and I do have a few hundred presents..
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John R. Ellis, Champion

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It takes Lightroom disproportionately longer to read large numbers of presets on startup, and that may have gotten worse with LR 7.3's new implementation of presets.  Try temporarily moving the presets to a folder on your desktop and restarting LR to see if that's the problem.  To find the folder where they are now stored, right-click one of the presets and do Show In Finder / Explorer.
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John R. Ellis, Champion

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Measurements I did in LR 7.3 for one of my plugins shows that LR uses an inappropriate "n-squared" algorithm for loading presets, where the time to load is proportional to the number of presets squared:

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Simon Chen, Principal Computer Scientist

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I think John is on the money in this case. If you have lots of presets, the launch time of Lr 7.3.x would be affected. This is fixed for the next Lr updates.