Lightroom is slow it is unworkable...

One thing I overlooked, Library standard previews. Yes, I know, your in Develop, but at some point those standard previews get updated, how large have you set them in catalog settings?

https://www.lightroomqueen.com/lightroom-performance-previews-caches/

By the way, a posting at Lightroom Classic | Photoshop Family Customer Community  on this issue BUT for MAC, reminds me of a few OS issues, hardware issues, etc that can crop up and screw LR up, before they screw PS up.

In your WIN OS, the TEMP directory, choke full of crap?

In your WIN OS, the paging  file, where is it located, how much space allocated, is the drive in use have issues?

In your WIN OS, has MS added a lot of bloatware, aka crapware, what crap is running in background

Due to an OS update, are some defaults rest to ho hum settings? Power setting for CPU comes to mind

(see #8 in 11 Tips to Speed Up Windows 10 - PCMag Australia )

Due to GPU  driver updates, has some setting related to its use reverted to ho hum defaults.

(see https://www.winhelp.info/boost-lightroom-performance-on-systems-with-nvidia-graphics-chip.html )

Do you need to accomplish a clean install of your GPU driver?

Is your GPU. driver up to date

(incidentally NVIDIA just updated many due to cyber security, see NVIDIA patches high-severity bugs in Windows GPUs and SHIELD – Naked Security , and Windows users: Patch your Nvidia GPU drivers to stop attackers running malware | ZDNet )

Hard drive damage? Check all drives.

RAM going out?

And make sure that you post your Problem at the official Adobe feedback site: Lightroom Classic | Photoshop Family Customer Community

Adobe techs interact at that site, not just us fellow customers

The problem is not the CPU, not the RAM, not the storage, not the GPU.

The problem is a weakness in Lightroom revolving around the fact that it is not a pixel editor like Photoshop.

In Pixel editor apps like Photoshop, when you create an edit, specific pixels get altered and that change shown directly. All the other pixels, the ones that do not get edited or changed stay the same. Photoshop only needs to display a change for those specific pixels. No sweat.

And in Photoshop, once you finished with Adobe Camera RAW, you are working on the actual image, not some preview that has to get recreated.

"Lightroom uses a parametric editing system, which means that when you adjust a photograph in Lightroom you simply are creating a set of parameters or instructions for how to interpret the image data. You are not changing image pixels, as you do in a pixel editor like Photoshop."  (source: Photo editing in Lightroom > Processing Photos in Lightroom's Develop Module ) This makes Lightroom a truly nondestructive editor and one that is flexible to use.,

in Lightroom (at least classic) in the Develop module, the image you see after each and every edit, or in some edits, as you manipulate the edit, is recreated each time you input an edit, and each and every bloody pixel is created in that display of the image, not just the ones that you virtualy edited. So, you just did a little spot edit, just a bit of the image, nope LR recreates the entire image display (remeber Develop not Library)

Also, LR looks at each and every edit it that has occured, reads thru one at a time and works its way to that preview (in develop), all the way back to your first edit

Not sure if you delete (clear) the history if that gets altered, see 3 Lightroom History Tips

So, you have a 4K, or a 5K display that Lightroom Classic neds to feed? 5120x28890? Something like 14.7 Million pixels? PROBLEMS! Run it at 2K? Not such an issue

The more edits, the more work, and when you get to Adjustment brushes and Spot Removals?

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It is the monitor/Display, and Adobe NEEDS TO FIX THIS. Competetors are coming out with Data Access management and already have nice GUI, and those apps do not appear to have this issue (could be wrong)

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In the meantime, and this has been broke for a long time

Trying to remember all the tweaks to attempt to improve performance on 4/5K displays

In Develop module, select 1:1 or smaller, 1:2, 1:3 (smaller view) to cut down on pixels in LR windows showing the image.

In Develop, make side, top, and bottom panels as large as possible, decreasing area available for the LR window showing the image.

In Develop, force use of Smart Previews

Clear History panel?

use a smaller (resolution ) monitor

And for a Windows OS, just reduce the resolution (MAC OS users are SOL on this one)

Hi Bart,

Sorry to hear about performance issues with Lightroom.

Have you tried turning off the GPU option from Lightroom's preferences? Go to Lightroom > Preferences > Performance tab > Uncheck "Use Graphics Processor" > Restart Lightroom.

You may also try the steps mentioned here and let us know if it helps: Optimize Lightroom performance

Regards,
Sahil

Oh its beyond a joke. I have an i7 with 1060 card and 32gb of Ram with scratch disks set to SSD's and the program itself running off of an SSD and runs like utter shit.

I don't care about new features anymore, having another clarity slider is second to the program performing correctly. In its current state this modern day solution is just utter rubbish. I guess this is the issue when a company holds a monopoly on the market.

PLEASE FIX PERFORMANCE ADOBE!