P: High CPU usage makes it unusable during export

Appreciate the testing guys, but I'm still experiencing the same slow downs. 

For example I just exported a few PSDs from RAW files and not only was Lightroom unusable, my music playing in a Chrome tab was cutting out.

Please look at this Adobe, I use Lightroom A LOT and it is not only painful but also makes me less productive.

Ran a test on my system just for grins. 
 
1304 EM1 raw files 
    tried 1305 but one file was corrupt and 
    didn't see the need to rerun for just 
    one file 
No concurrent tasks 
Xeon 6-core 36/40 GHZ 
 
==== TIFF test ==== 

Image Format: TIFF
Compression: None
Color Space: Adobe RGB 
Bit Depth: 16 bits/component 
Resize: unchecked 
Sharpen: unchecked 
Include: All Metadata 
Watermark: unchecked 
 
12 threads driven with about the same load per thread 
CPU 77-85% 
Memory 6.01-6.08 GB
Disk 108-127 MB/s 
GPU 0% 
 
Duration: 22:05 
Exported Size: 108 GB  
 
==== JPEG test ==== 

Image Format: JPEG 
Quality: 100%
Color Space: sRGB 
Resize to Fit: Dimensions 
Don't Enlarge: checked 
3840x2160 
240 pixels per inch 
Sharpen: Screen 
Amount: Standard 
Include: All Metadata 
Watermark: unchecked 
 
12 threads driven with about the same load per thread 
CPU 74-86% 
Memory 7.4 GB
Disk 16-26 MB/s 
GPU 0% 
 
Duration: 24:58 
Exported Size: 7.63 GB

 I've been measuring and it seems that the problem is solved in the latest LR updates.

PC, con CPU: Intel Core i5 6600K a 350 Ghz, RAM: 32 GB, GPU Intel HD Grafic 530 y Windows 10 Pro

C: Samsung ssd 970 evo plus 500gb (operating system and programs)

😧 Kingston HyperX Fury SSD 240gb  (develop Ligthroom).

E: Western digital blue wd5000aakx 500gb (My documents)

F: Western digital blue wd5000aakx 500gb (Retouching Photoshop)

G: Western digital Green wd10earx 1000gb (Finished photo)

It is true that the CPU is at or near 100% when exporting from the Lightroom.

But it automatically drops the % if I'm using other applications:

 Yesterday I measured the export of 1305 ORF (Olympus raw OM-D E-M1 ) to Tif (91 MB) and the time was 41 minutes, while I was stacking with the Zerene Stacker and cleaning with the touch-up brush in Photoshop, no problem.

When you are working live tethered in an event and need to export almost live while still capturing and with the client breathing on your neck, wanting both his exports and selecting the live shots, this is unusable and the client laughs at Lightroom or how you have a slow laptop even though you have a 4000$ machine to try and minimize that issue. It is a bug for that use case.

"Exporting seems to be primarily a cpu intensive task."

Indeed. I just did a quickie timing and my Macbook Pro exports a large batch of raws to the internal SSD at a rate of about 1 per second, with each exported JPEG averaging 8 MB.   So that's 8 MB per second written to the disk, an order of magnitude less than spinning disks (even cheap ones) are capable of.

Thanks for the rapid mode tip. I have read an article showing that ssd's only give a very minimal performance boost when exporting in Lightroom, even when compared to slow platter drives. Would rapid mode really make much of a difference? Exporting seems to be primarily a cpu intensive task.

https://www.pugetsystems.com/labs/art...

In response to your second question, everything slows down and the cpu is at 100%

1. recommend that you turn RAPID mode for this drive
2. do other operations just slow down a bit or does the machine become unusable? Slowdown to be expected as resources are being shared but should not become unusable. 

Desktop, 32gb ram and Lightroom catalog on dedicated ssd

Laptop or multi-drive desktop? 

I'm experiencing severe slow down on a new i9 Windows machine