From a 2012 iMac to 2019 iMac for Lightroom

So, what you need is an iMAC 5K memebr to answer back. Prefrerable one with an add on external monitor that is not 4K or beyond, to find out if running LR Classic on that lower res monitor fixes the issue

Also, perhaps a iMAC user with LR 8.4 that does not have these issues.

Remeber that my test is on an 15" MACBook Pro Retina 2015, some issues with the OS drive in terms of build (taht odd combined flash thingy), and only 16GB RAM, and a mid range GPU with only 2GB VRAM.

That GPU will be very important starting at LR Classic v8.4

Hmm, normaly I only run LR Classic on my travel Notebook using the builtin screen. Work at home via my more capable home built WIN 10 Workstation, on a nice LG 31MU97 4K Monitor.

Also, when I do use the laptop at home, I am running that display not at 4K but at a scaled down state (yes does not reduce the resolution)

Now I had not noticed such nasty issues. Mind you not a 5K rig in any way

So, as a test,

1. In LR Classic brought up a large combined HDR / PANO image 214.2MB

2. Run in my standard configuration scaled down for large text

3. Added some additional adjustment brushing.

Now I do not run max full wind, and not so bad

But if I max the window, Not as fast as on the Windows rig (I only run that at 2K res, my call)

But not SLOWWWWWWWWWWWW

4. Exit LR, turn off the scaling, Restart LR, go for that maximum screnn, Yikes spininning wheel just to get the overlay

5. Now, as several of the contributing members above know, one could always simply not use a high deff monitor. I nifty, this is a notebook. So divorced the 4K monitor and ran soly off Notebook screen (2880x1800) and what you know, nice and zippy, no slowdown

Hmm a nice advantage of using this MACBook Pro,as opposed to say an iMAC, I am not stuck with a 5K display I paid big bucks for (the external LG is not all that bad in $$) And I can simply not use the high depth while doing such work. I do not have to stomp and shout about big bucks on a super duper 5K monitor. And that lower res display is ready at hand.

________________________________________________________

As stndard, truntcated sys info provided below:

Lightroom Classic version: 8.4 [ 201908011719-03751b60 ]

License: Creative Cloud

Language setting: en-US

Operating system: Mac OS 10

Version: 10.14.6 [18G87]

Application architecture: x64

Logical processor count: 8

Processor speed: 2.8 GHz

Built-in memory: 16,384.0 MB

Real memory available to Lightroom: 16,384.0 MB

Real memory used by Lightroom: 6,185.3 MB (37.7%)

Virtual memory used by Lightroom: 10,482.2 MB

Memory cache size: 15.8MB

Internal Camera Raw version: 11.4 [ 273 ]

Maximum thread count used by Camera Raw: 5

Camera Raw SIMD optimization: SSE2,AVX,AVX2

Camera Raw virtual memory: 4525MB / 8191MB (55%)

Camera Raw real memory: 4551MB / 16384MB (27%)

Displays: 1) 4096x2304, 2) 2880x1800

Graphics Processor Info:

Metal: AMD Radeon R9 M370X

Application folder: /Applications/Adobe Lightroom Classic

Library Path: /Volumes/G-RAID with Thunderbolt/Pictures/Vacations and Day Trips/Photo Trips/18 Vacation August 2017/18 Vacation August 2017-2.lrcat

Settings Folder: /Users/davidgolding/Library/Application Support/Adobe/Lightroom

Installed Plugins:

1) Aperture/iPhoto Importer Plug-in

2) Aurora HDR 2018

3) ColorChecker Passport

4) HDR Efex Pro 2

5) Iridient X-Transformer

6) jf Metadata Viewer

7) Loupedeck

8) Luminar 3

9) ON1 Photo RAW 2019

10) ON1 Resize 2019

11) Show Focus Points

12) SmugMug

________________________________

___________________________________

Oh, and a mid range GPU with just 2GB VRAM, and I think that older OS drive thats 1TB in size

hmmm, I see my standard previe size is huge *4K) should play with that

Hi there,

We've just released Lightroom Classic version 8.4 which takes advantage of the GPU for Image editing process. You can read more about it here: New features summary for the August 2019 release of Lightroom Classic

As of now there have been no reports of it being slow on a high resolution display.

Regards,
Sahil

There have been many reported problems with slowness on 5K screens, especially if you do a lot of brushing or spot healing.

Just yesterday, a new version of Lightroom was released (version 8.4) which claims to provide major speed improvements; but it is too early to know if that is actually happening for people who previously had very slow Lightroom with 5K screens.