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I did some digging for you, there's a 3 year old post from a Mac user on Adobe's help forum for Lightroom Classic version 8.1:
Lightroom Classic 8.1: Using too much memory and crashing on iMac with 64GB of RAM

If you go digging around the Adobe help forum, you may try some of the suggested solutions and troubleshooting to resolve this issue, but I've screen-captured some points that may or may not help.

If you're intent on keeping your Macbook, I would try extensively troubleshooting the issue otherwise just return the laptop at the Apple Store and stick with your older system.
 

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This feels like a memory leak and a problem that Lightroom should absolutely fix. Are you seeing similar slowdowns in other programs?

I use Capture One Pro and it's working pretty well, I haven't run into any issues on my 16GB 14in Pro

How's it rendering full screen previews? I went overkill and got an M1 Max because I wanted it to completely blitz through full screen RAW renders in Capture One Pro. I haven't received my 16" Max yet. All of these trouble reports are making me a little apprehensive about maxing out my purchase, but I know that it often takes a year for all of the weird kinks to get ironed out.
 
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I am sorry but you should have researched more before getting the MacBook Pro. Lightroom classic is just bad and it doesn't matter how much RAM you have. You should change the thread to "I am not impressed with Adobe Lightroom"
You mean they should change the thread to "I am not impressed with Adobe Lightroom on the Mac."
 
There is an entire industry built around portable workstations with 10‘s of thousands employed and it’s called live event production. 9 out of 10 are using laptops for just about every type of work you can do at an event. Next time you are on a plane and see someone dressed in black with a backpack remember this conversation.
? Did you reply to the wrong guy? I’m not questioning the need for a portable workstation, just telling the guy who was comparing a laptop with a desktop workstation it’s silly to do that.
 
You're judging the Mac by how Lightroom performs (a well known poorly written programme).
Doesn't seem fair to me.
No, I think it’s fair. I mean, I could just as well judge a Windows PC by how well it runs FCP. I think it’d be unfair if the software they were attempting to run was not defined. I mean, if I needed to run Lightroom, I wouldn’t be impressed either.

Because the software being run WAS defined, that allows people to assess the information. “Gee, I really need Lightroom in my workflow, guess I’ll keep what I have it working on already,” or “Oh, I don’t need Lightroom, so I have nothing to worry about.”
 
Not major editing..... not cutting video.

Just importing images.

I realize that Lightroom is one of the worst written modern programs, but I honestly expected more out of a MBP.... I bought a 32 gig M1 Max EXPECTING it to be able to handle simple things like image import.

#NotImpressed

How many images were you importing? Every single one on your HD?
 
I was running a few pro apps and safari and was nearly hitting 32gb.
However I know I always sail close to it most of the time, so got the 64gb for the times I go above.

You should know your usage before buying a computer. Its not hard to work out.

But as an aside, for all those people I have read on these forums saying M takes less ram, I would suggest it is exactly the same as ever, when using creative apps. The file sizes stay the same.......

One last thing - my maxed max is the most insane computer I have ever used. I find it absoultely outstanding in everything I have thrown at it.
It competes on 95% of my work with my 16 core Ryzen desktop with a 3080ti gpu. This is amazing for a 14" laptop.

Still dont love the notch but all things considered, these MBP's are outstanding pro machines.
 
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I don't have LR 10.3 to benchmark against, but on a clean install with LR 11 and a restored catalog, it has been fine. 4-5GB of memory use on average.
Ditto here. Wonder if the OP is using an old version - they've been pretty bad recently. The catalog 11 on ARM as a native app is finally snappy (well, better actually) like the old Fusion 8 on my 2017 MBP was.
 
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I was running a few pro apps and safari and was nearly hitting 32gb.
However I know I always sail close to it most of the time, so got the 64gb for the times I go above.

You should know your usage before buying a computer. Its not hard to work out.

But as an aside, for all those people I have read on these forums saying M takes less ram, I would suggest it is exactly the same as ever, when using creative apps. The file sizes stay the same.......

One last thing - my maxed max is the most insane computer I have ever used. I find it absoultely outstanding in everything I have thrown at it.
It competes on 95% of my work with my 16 core Ryzen desktop with a 3080ti gpu. This is amazing for a 14" laptop.

Still dont love the notch but all things considered, these MBP's are outstanding pro machines.
I'd actually say it's more because it's now shared VRAM and system memory. If you had 16 before, get 32. 32 before, get 64.
 
I'd actually say it's more because it's now shared VRAM and system memory. If you had 16 before, get 32. 32 before, get 64.
Not necessary. It's so much more efficient now with the SSD swap, etc. But there are other threads on that.
 
I just don't even know how you couldn't be impressed with the 16"! its a beautiful machine in every way! I typically don't even like large computers but this one is so nice and powerful! what's not to like!?
 
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How slow this M1 Pro is. Over 3 minutes slower than the 11800H/3080 with oled screen.
 

How slow this M1 Pro is. Over 3 minutes slower than the 11800H/3080 with oled screen.

Thats a pro with only 16 cores against a 3080. So that all seems about right even the 32 core M1 max would be just under that 3080. I think apple has lots of software bug fixes to make to smooth this thing out mine is not what I expected but I am a software engineer and really need Mac OS. Sadly most of these issues prob wont be fixed until the M2.
 
Unless I’m missing something, 900,000 images in a 15GB catalogue, means each photo is approx 17 Kb. That’s unusable? Isn’t it?
The LR catalog file is just a database that stores information about the photos. The photos themselves are stored separately, as are any previews the app has built.
 
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