Lightroom Classic Issue with CPU reaching 500% on brand new MacBook pro

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  • Updated 4 weeks ago
  • (Edited)
Hi all, 
Recently I bought a brand new full spec MacBook pro, pulled my old library into Lightroom classic and instantly the fans became insanely loud. Battery dropping around 20% per 10 mins and was red hot (even when plugged in)

I looked into the activity monitor and lightroom was running the processor at over 550%. It was unusable.


So basically after a lot of trial and error I found that the face detection was on, this was causing the CPU to go nuts. Once it was turned off and restarted, LR started working normally.

I want to report this bug as this could potentially break user's CPUs and needs to be fixed quickly.

Mac info:
Macbook Pro 2018
MacOS: Mojave 10.14.4
Processor Name: Intel Core i7
Processor Speed: 2.6 GHz
Number of Processors: 1
Total Number of Cores: 6
L2 Cache (per Core): 256 KB
L3 Cache: 9 MB
Memory: 32 GB
Chipset Model: Radeon Pro Vega 20
Chipset Model: Intel UHD Graphics 630

Lightroom catalogue size 9000 images (not that many in this catalogue!)
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Chris Gilloch

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Posted 1 month ago

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Just Shot Me

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So installed LR on your new MBP and then Copied over your original LR Catalog File. When opening that catalog the system started to build heat.
This is normal with those options turned on. It is not a Bug.


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Chris Gilloch

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Nope. The catalogue has been there a few weeks, it has been like that every time I have run lightroom. Previews had been built etc. 

If I had left it run, the battery would have died even with the power cord as the CPU was so running so high for so long. 

I've used LR from its first iteration, I'm very used to its heavy CPU usage but it always dies down once it finalises what it is doing (preview building etc) but this was something a lot more severe. 

Endless 550% CPU is not normal when you are not actually doing anything. It is a bug, it needs to be looked into.
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Rikk Flohr, Official Rep

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What happens if you turn on Face Detection again (after a computer restart)? Does it go to 500% and stay there still?