Export files is so much slower on Mac vs PC. Why?

[PastaRhymes]

Ever since i switched my LR workflow form PC to Mac, it has become painstakingly slow. On my PC (i7 8700K 6-core, 32GB RAM, GTX 1080) it would utilize 100% of the CPU and speed through the exporting process. Exporting 300 Raw photos to Tiff would take me 2-3 minutes at most.

Now on my new 2018 MacBook Pro (2.6GHz 6-core, 32GB RAM, Radeon Pro 560X 4096 MB, 1TB SSD) it takes at least 4x longer. The CPU doesn't get fully utilized most of the time and and it's definitely not a throttling issue due to heat development. Everything stays cool and the fans stay quiet.

In the settings I made sure the graphics card is active and the Camera Raw Cache is at 40GB.

Importing is also much slower when importing hundreds of files with 1:1 preview and smart preview generation.

Any idea why it's so slow on Mac compared to a PC?

[KR Seals]

Are you on Mohave? There are a lot of reports of poor performance on Mohave.

Are you running on battery or wall power. There have been a few comments about MacBooks slowing down the processor on battery power. I use a 2015 rMBP for travel, but I prefer my PC, specs similar to yours, for serious day to day use.

[PastaRhymes]

Yes, I'm on Mohave because that's what it came preinstalled with. I just got a 2 weeks ago.

When I edit stuff I always have it hooked up to a charger as I have the suspicion as well that being on battery power might throttle performance.

[KR Seals]

It might help if you search the forum for "LR slow on Mohave" or something like that to see all the older threads. I don't recall if there is a solution or not. I'm sticking with High Sierra for now.

[Rafael Aviles]

https://forums.adobe.com/people/KR+Seals  wrote

It might help if you search the forum for "LR slow on Mohave" or something like that to see all the older threads. I don't recall if there is a solution or not. I'm sticking with High Sierra for now.

KR, he will get much better results if he spells the operating system correctly. It is “Mojave”, not “Mohave”.

[KR Seals]

You are right about that.

[PastaRhymes]

Sorry, I wasn’t sure about the spelling so I just repeated it the way KR Seals wrote it. I’ll take a look to see what others say regarding LR performance in Mojave.

[GoldingD]

Is that laptop plugged in or on battery? If plugged in, then, no, nit throttling for power conservation reasons.

[GoldingD]

By the way, are you connecting to an external monitor at 4K, or 5k?

[GoldingD]

In the following link, that I imagine you have probably looked at before, scroll down to “Optimize your operating system for Photoshop”, then further down to “set power options”

Optimize performance Photoshop CC

lots of other items to work work with in that link.

the reason to consider power options is that both Apple and Microsoft defaypult to defaults for general use.

[PastaRhymes]

Yes, I'm always plugged in when editing.

Yes, I read the link and optimized everything for LR and PS.

I do use 34" screen with a resolution of 3440 x 1440 but that problem is also there without an external monitor.

[GoldingD]

So, your external display is at or around 3k, try reducing it down to 2K numbers. Perhaps 1920x1080

Lightroom has trouble when it starts using huge preview files, especially in develop

[PastaRhymes]

I also had it on a 1080 display which didn’t change anything. Especially import and export is super slow.

[Todd Shaner]

PastaRhymes  wrote

Now on my new 2018 MacBook Pro (2.6GHz 6-core, 32GB RAM, Radeon Pro 560X 4096 MB, 1TB SSD) it takes at least 4x longer.

See this post and add your 'Me To' vote and 'Follow.' MacBook Pros seem to be affected with LR performance issues after upgrade to Mojave. There doesn't appear to be a solution offered at this time other than down-grade to High Sierra. This appears to an old bug resurfacing where systems with more than four core processors (6, 8, 12 cores) exhibited poor LR performance. Something in the Mojave upgrade may have "broken" the LR update Adobe implemented to fix this on Mac OS X systems.

Lightroom Classic: Slow on MacPro with macOS Mojave 14.0 (even after full reinstallation) | Photosho...

[Jao vdL]

I just tried exporting a few hundred files (16-bit tiff zip compression, no resizing) and it is really fast with about a speed of 1 minute for 100 raws. Fully pegs the CPU at 1200% (6-cores with hyper threading) and the CPU monitor shows it fully pegged on all cores. This is a 2018 MBP too on a fully up-to-date Mojave with 32 MB of internal and a 1TB SSD. Importing using my Sony XQD card adapter (awesome and cheap) goes at the speed of the adapter and media of 400-500 Megabytes/second.

[Jao vdL]

Oh and as you would expect, the screen resolution has no impact on the speed of exporting images.

[GoldingD]

It can if you are creating full previews

[Jao vdL]

Only if it is creating those at the same time in the background. If you just do a plain export of a bunch of images selected in grid view, the screen size or preview size has no influence. The previews are not used in any way in export.