1. Is there a progress bar visible in the upper-left corner of LR? It would look like:
While LR is building previews or smart previews, CPU usage can get very high.
2. After you stop editing and scrolling in the Library and there's no progress bar visible, does the LR CPU usage drop down to under 10% within a few seconds?
On my Mid-2015 Retina Macbook Pro, I see sustained CPU usage above about 500% when it's building previews. I see it spike up and down to peaks of 300-400% when I edit a large raw, and the CPU drops to under 10% as soon as I stop touching the mouse or keyboard.
It's normal for the fans to run a lot when the CPU is being used, and it doesn't hurt the machine: About the fans in your Mac - Apple Support. My fans are running constantly when I use LR.
Thanks for the reply. No there's no progress bar unless I'm exporting/building previous. This is occuring when I'm just viewing and editing RAW files in the develop module.
And yes, CPU drops quickly after I literally just stop touching the computer.
While I understand it's normal for fans to run and CPU to spike during extensive use, I never considered editing a RAW file extensive. Not like playing a graphic intensive game would be. In fact, my older Macs don't/didn't have a problem with the same files, same os and same version of LR.
So when I'm culling through a 1000 images for project for 4 hours and the fans start at full blast with the CPU in the 400-500% range in literally a matter of a few seconds of starting my work, it's kind of concerning in my opinion.
How many other apps do you have open when this happens? Do you have browsers open too?
I have a late 2011 17" MBP and when the fans are roaring it means I have too many applications open with large files that I have done a good deal of processing on. Eventually I can't stand the fan noise and will shut down apps/files etc. Often times the real power hog is related to something open in a web browser. If you are in a spot where you can close down browsers and other applications and perhaps even power cycle the laptop that will clear what you have in RAM.
I can have safari (tons of tabs open), Spotify, message, mail, calendar, Evernote, word, run a HD video on youtube all on at the same time and the fans won't come on. Close everything, start up LR and browse images in develop module and fans start in seconds which leads me to believe its more software vs. hardware - especially since I've done a clean install at the Apple Store as well as 2 diagnostic tests (in store and online chat)
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Lots of people have complained about the fan noise (my wife does), but I think it's normal:
Editing a raw file is CPU intensive, and Adobe has worked hard to make it even more so over the past many years. That is, the number one complaint about LR is that it is too slow, so Adobe has enhanced LR to use multiple processors more effectively, so that Develop is more responsive and so that they can support additional features in Develop.
The 2015 Macbook Pro uses the high-end faster laptop processors, which consume a lot more power (and thus generate a lot more heat) than mid-range and older processors. In addition, LR 6 uses the graphics processor (GPU) in Develop, which generates additional heat. (LR doesn't use the GPU on older computers.)