Bought 8 core MBP, Lightroom uses only 4 of them

[Robotti]

My previous setup was an 8-core, 16-thread Windows workstation and a 4-core, 8-thread i7MacBook Pro. Now I've decided to replace both of them with the new 8-core i9 MacBook Pro.

When I'm using Lightroom, I only ever get maximum of half the CPU threads working for me, and sometimes even less than that. For example, converting to DNG and exporting, I never get full thread usage, It varies between 50% and 25%. On Windows, I get 100% every time, all the time. Is there a specific setting buried somewhere, or does Lightroom for Mac scale for i7 and i9 so much worse than on Windows? Right now, it's a pain working on this MacBook. Converting those DNG's takes 3-4 time longer than on Windows. The difference is massive.

 

[HDFan]

I don't have your specific hardware, but on an iMac Pro doing a very large .cr2 to DNG export I'm seeing all virtual cpus (36) being used. Use graphics processor is set to auto.

 

[tizeye]

Photo is low demand...now do a video your camera is capable of.

 

[Darmok N Jalad]

What version of Lr are you using?

 

[Robotti]

It's the latest version as of now, 9.0. Something odd happened. I connected the laptop to an external display, and now it's working as expected. All cores running at full speed in Lightroom. Even when I disconnect it from the display. Maybe it was some kind of configuration issue that resolved itself?