macbook pro 16inches. Fan issue with Lightroom Classic

Started 4 months ago | Discussions thread
robgendreau Veteran Member • Posts: 7,280
Re: macbook pro 16inches. Fan issue with Lightroom Classic

Matt86 wrote:

Hi all,

my apologies if the subject has been already discussed but this is something that drives me crazy especially after having paid a new macbookpro 6 thousand dollars.

My mbp has the following features:

  • 64 GB of RAM
  • 2.4 GHz 9-core ninth genration Intel Core i9 with Turbo Boost up to 5.0 GHz
  • AMD Radeon Pro 5500M with 8GB of GDDR6 memory
  • 1TB of SSD storage

I use photoshop CC, final cut pro in a professional use and I have no issues at all. As soon as I use Lightroom Classic and I start using some brushes or filters or few sliders the fan of the macbook pro starts and it sounds like an airplane ready for take off.

Obviously the mac gets slow straight away and to work on a RAW file of 30 something mb becomes very hard.

I wonder if it is my computer or a problem related to Lightroom Classic.

I'd say it's a problem related to Lightroom as, as I mentioned above, I do other milion things with my mac and I have never heard the fan working full revs.

My mac is connected to a Benq SW270c 2k external monitor through USB-C port.

My lightroom catalogue is on an external SSD samsung

The cache has been increased up to 200GB

The original photos are on an SSD

The catalogue includes arouns 70,000 pictures.

Don't know if you need any other info, but I really need your help.



It's hard to say, but I'd start by getting something like iStat Menus so you can look at what tasks and applications are using the most horsepower. And of course you're ambient temp matters some. Or just Activity Monitor:

I'd also try moving the Lr catalog and previews to your boot drive. I don't know how fast that external is, but it could be slower. It's not an especially big catalog, but if it's processing lots of 1:1 previews and with big images that have lots and lots of local edits that will be the most processor/heat intensive.

And try to isolate the problem. If Lr is churning through preview generation while you've got a video playing on the external as you do adjustments on a 20-layer 50MB photo in Ps, well, Sometimes people think, hey, didn't happen on my old mac! but consider that sometimes that old machine was self limiting in it's slowness, sort of like how a Corolla just can't overheat the same way a Merc F1 car can.... Maybe limit use of the DGPU, even though it might slow some processes down. And if something going in the background slows from a 2min task to a 5min task, so what? the adjustment brush you're using right now might be more important.

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