This doesn't happen on all files (and it isn't consistent as to which files...two shots taken minutes apart with the same camera and lens, and one it won't process correctly, but the other it will. If it messes up on a file, it always messes up in the same way if you try again. It doesn't matter whether GPU processing is enabled or not.
Example showing the effect: http://www.jordansteele.com/2019/enhanced.jpg
System Info:
Lightroom Classic version: 8.2 [ 1204643 ]
License: Creative Cloud
Language setting: en
Operating system: Windows 10 - Business Edition
Version: 10.0.17763
Application architecture: x64
System architecture: x64
Logical processor count: 8
Processor speed: 4.0 GHz
Built-in memory: 32726.0 MB
Real memory available to Lightroom: 32726.0 MB
Real memory used by Lightroom: 824.8 MB (2.5%)
Virtual memory used by Lightroom: 1044.2 MB
GDI objects count: 765
USER objects count: 2833
Process handles count: 1906
Memory cache size: 117.5MB
Internal Camera Raw version: 11.2 [ 134 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 158MB / 16363MB (0%)
Camera Raw real memory: 158MB / 32726MB (0%)
System DPI setting: 96 DPI
Desktop composition enabled: Yes
Displays: 1) 2560x1440, 2) 1920x1200
Input types: Multitouch: No, Integrated touch: No, Integrated pen: No, External touch: No, External pen: No, Keyboard: No
Graphics Processor Info:
DirectX: NVIDIA GeForce RTX 2070 (25.21.14.1881)
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Posted 10 months ago
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That’s subtle by comparison of what I’m getting. Enhanced details takes about 10 minutes to process one photo and this is what I get as a result. I’m running the most current version of Mac (10.13.6) This update is a far cry from what Fuji shooters were expecting when we read it improves Fuji x-trans files and absolutely not what we should have to deal with. Really considering leaving for pretty much anything else. I’m getting tired of Adobe sitting in the corner eating glue while everyone else has figured out how to read and display Fuji RAF files flawlessly for years now

Note: This conversation was created from a reply on: Lightroom Classic CC: Line artifacts in Enhance Details.
John R. Ellis, Champion
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John R. Ellis, Champion
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Most likely that's because Mac OS is using the CPU rather than your relatively older GPU (graphics processor) to do the machine-learning computations. You can verify in Activity Monitor by doing Window > GPU History.
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John R. Ellis, Champion
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It seems that MacOS 10.13 has bugs in its machine-learning library (Core ML) that LR trips over, and these bugs are fixed in 10.14. I.e. the issue is unrelated to whether your hardware supports Metal.
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Enhance Details works fine on my 2013 Mac Pro (AMD D500 GPUs) running MacOS 10.13.6. Processing times for Nikon NEFs and Fuji RAFs are between 10-20 seconds. The rendering quality of the X-Trans files is typically similar to that of Iridient Developer and Iridient X-Transformer.
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BUT! Be aware that Apple cut it's support for a wide range of NVidia graphics card with the Mojave update. Although officially being 'unsupported' it has been possible before to use NVidia GPUs (e.g. in an upgraded Mac Pro 4,1 or 5,1), but after the Mojave update Apple seems to refuse to cooperate with NVidia to develop / update new drivers required, rendering NVidia cards useless. There is all sorts of complaints about this on the internet and it seems that this will be a permanent issue.
I was running a Mac flashed NVidia GTX 980 in my Mac Pro 5,1 and switched to a Sapphire RX 580 PULSE for around 200 €, which is fully supported by Apple. Everything works nicely again and performance is even a bit better but I still would have appreciated to spend the money on something else... ;)
https://support.apple.com/en-us/HT208898
Rikk Flohr, Official Rep
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RTX2070, Windows 10.
Simon Chen, Principal Computer Scientist
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I updated my Mac Pro with a Sapphire Pulse Radeon RX 580 GPU. System Info reports: Metal: Supported, feature set macOS GPUFamily1 v3. The Geekbench performance is significantly better (*10) than the original card. I'm running 10.13.6.
Enhance Details still fails with colored squares all over the image. And it takes a long time - on the order of 3 or 4 minutes.
I have access to a 2017 iMac with a "Radeon Pro 580" graphics card. It's running 10.13.6 also. It's Geekbench score is slightly less than my Mac Pro now. Here's the deal, however. The iMac runs enhance detail in 30 seconds or so with no squares. (We can talk later about if I can a significant difference.)
One idea is CPU speed matters a lot. My Mac Pro is a 2.8 GHz Quad-Core Intel Xeon while the iMac is a 3.8Ghz Intel Core i5. Whatever the problem, I can't see that Lightroom or ACR are using the GPU at all. I have 'Use GPU' checked and Adobe "System Info" reports:
Graphics Processor Info:
Metal: AMD Radeon RX 580
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glgpu[0].GLVersion="2.1"glgpu[0].IsIntegratedGLGPU=0
glgpu[0].GLMemoryMB=8192
glgpu[0].GLName="AMD Radeon RX 580 OpenGL Engine"
glgpu[0].GLVendor="ATI Technologies Inc."
glgpu[0].GLVendorID=4098
glgpu[0].GLRectTextureSize=16384
glgpu[0].GLRenderer="AMD Radeon RX 580 OpenGL Engine"
glgpu[0].GLRendererID=16915464
Which seems to say they 'see' it, just refuse to use it.
John R. Ellis, Champion
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This could be a Mac OS bug, not a LR bug. See this discussion:
https://forums.adobe.com/message/11012837#11012837
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Simon Chen, Principal Computer Scientist
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That same file processed on a MacBook Pro (2018) with a Radeon 560 GPU and 16Mb ram did the same in only 8 seconds!!
I am convinced that a fast GPU makes all the difference. The folks at Lightroom recommend a dedicated GPU for this process.
george
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