Lightroom extremely slow on Mac

Very similar to my experience on a 2019 iMac. LR Classic was working fine but in the last few weeks it's suddenly become very slow to import, develop (takes ages to past settings) and either hangs completely if I try to do healing using the brush tool or else LR simply crashes and a couple of times has even crahed my Mac causing it to restart. Problems seem to begin with issues with Abode Creative Cloud app being reported "corrupted." Have reinstalled LE and CC app repeatedly with no real progress.

I've nevere heard such misguided information. I have a 6 core 3.6Ghz Zeon with an 8GB GPU that is STRUGGLING with the most current vesrion of LR. a "Mac" is not the issue it's Adobe's inept coding.

Photoshop has no issue it's Bridge and mostly Lr for some reason. 

Also maybe you cam expain why Phase One can write Capture Pro 20 to run just beautifully on a 2012 iMac with 16GB of ram , A 2010 Mac Pro with 48Gb of ram and a 6 core xeon with an 8GB saphire card, and a 2014 MacBook Pro with only 8GB ram and the satndard i5 that came in the lowest cionfiguration? So please make sure you know what he issue is and it's simply Adobe's engineers. It;s a cumbersom software period.

Hallo Lightroom Classic users and Adobe. 

I have the same problem, and now even more with the new macOS Big Sur (Bèta 11.0).
My imac is a Late 2015 model with Retina 5K display. It has 32 GB 1867 MHz DDR3 Memory.

The 4 GHz Quad-Core Intel Core i7 processors, the AMD Radeon R9 M395X 4GB videocard.

And i'm using two Canon EOS1DX mark II camera's. My RAW images are stored on a Pegasus32 R6 and R4 with Thunderbolt.

And when i'm editing my photo's.... Lightroom is sooooooooo slooooowwwwww........ only to switch between a picture left and right... it take seconds to see the picture itself... not even to be sharpen it. I also use Photo Mechanic 6, and if i change between pictures over there... it go's as normal, 1 sec, 1 sec, 1 sec, plop plop... in Lightroom.. click arrow right.... wait, wait, wait... a there is my picture... so frustrating. 

And i just bought this iMac one and a half year ago. Don't get me wrong, i love the new Lightroom. BUT I NEED THE IPTC INFORMATION. And there is no way to insert all the info i need for my company in the picture.
That's the main raison i still have to use Lightroom Classic. 😞 i miss the exented IPTC information. 
If adobe would like to add those iptc and Exif (for the ones who uses that) lines it would be amazing.

Greetings from the Netherlands, Levin.

I have the same issue with Lightroom CC (v 8.3.1, Camera Raw 11.3) now running very slow or freezing while generating panorama or HDR images. Panorama HDR are almost impossible to generate.
I have been using Lightroom CC, always the latest version, for a year now running initially on a 2014 MacBook Pro 13 with 16 Mb of RAM and 1 To of SSD and since June, on a 2019 model with Touch Bar and the same spec as my 2014 model.  I update the OS whenever a new release is coming out and am currently running 10.14.6. I have 350 GB of free space on my ssd.

My Lightroom catalog is 1.1TB on a 5 TB LaCie hard disk with 1.5 To of free space. I take pictures with a Nikon D850 that are around 50 MB each and merge 3 to 15 images together.

I noticed the problem a few days ago and did not have these issues a couple of months ago even when running the older 2014 Mac doing the same work on 50 MB images.

I have done several things to solve the issue :

- tried using my 2014 Mac

- reinstalled Lightroom

- disabled plugins.

- increase Camera raw cache to 100 GB

- disabled graphics processor

None of these made any difference. I can usually generate the first 3 image HDR previews very quickly, in less than 10s, with another 10s to create the file.  The 2nd preview is fast as well and the 3rd starts to get very slow, several minutes to generate a 3 image preview. 

Please get back to me as I just got back from a trip and have several hundreds images I need to process and am losing a lot of time!

For every Mac owner that complains about speed, you can find a PC owner with an extreme top of the line machine that can't believe how slow Lightroom is. You would be just as disappointed with a windows machine no matter how much money you spend and how much time you spend on speccing the whole thing out. This forum is full of this complaint and there is some validity to it. The reality is that Lightroom has real issues with doing lots of local adjustments on high MP files on high resolution displays regardless of the hardware. This is true for ANY current computer, even top of the line and configured well and is fundamental to how Lightroom's non-destructive raw engine actually works. Currently, brushing for example is not GPU accelerated and this leads to real slowdowns when you start doing that. This will undoubtedly change in the future but we are not there yet. MacBook Pros are rather well configured machines for Lightroom with very fast SSDs and memory architecture. The iMacs and iMac Pros less so because of the very high resolution displays coupled with not top of the line GPUs that really tax Lightroom's architecture.

I mainly shoot a Z7 nowadays and edit on a relatively recent MBP and it works really smoothly and very fast. I rarely do local brushing which is probably why it works so well for me. Even on my older year 2012 MBP it works OK. Certainly doesn't fly but I can edit Z7 files on it without getting frustrated.

Oh, and in that link I provided:

10 Tips to Improve Lightroom's Speed and Performance Without Additional Hardware  (see part 4)

Look at your Standard Preview size.

1. As your display is apparently sub 4K, the use of graphics card acceleration is probably of no value, and the best you can hope for is that enabling that option accomplishes nothing (as opposed to fouling things up)

2. As it apparently has issues in Library mode as well as Develop mode, Pushing up the Camera RAW CACHE probably will not improve your performance. Oh you might want to try that anyway.

INQUIRY, despite what I just said, what is your Camera RAW CACHE set to?

3. Is this issue for new as well as old images? If not for new ones, perhaps the library previews are corrupt? You might consider deleting them outside of LR, then restarting LR

Attached, a few  links to MAC OS performance tweaks

https://computers.tutsplus.com/tutorials/how-to-give-your-mac-a-performance-boost--mac-46271

https://www.macbookproslow.com/speed-up-quick-checklist/

LR Performance Issues - YouTube

Slow Mac: Why is My Mac Running Slow? | 17 Ways to Fix Your Slow MacBook, iMac or Mac Mini

https://photofocus.com/software/speed-up-your-lightroom-classic-catalog-on-fusion-drive-macs/

Tuning Mac OS X Performance

Why is my Mac so slow?: 6 ways to speed up your Mac - Business Insider

Hi nancyd,

That isn't a great user experience as Lightroom is running unexpectedly slow, we're sorry to hear about this.

Which version of Lightroom are you using?

As Lightroom is running slow, could you please try turning off the GPU option from Lightroom's preferences? Go to Lightroom > Preferences > Performance tab > Uncheck "Use Graphics Processor" > Restart Lightroom and let us know if it helps?

For more info and further troubleshooting refer Adobe Lightroom GPU Troubleshooting and FAQ​

Let us know if that helps.

Thanks,

Akash

What is the size (in pixels, not inches) of your monitor?

Are you doing a lot of local adjustments (brushing, spot healing) on these photos?