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Known Participant
November 27, 2025

P: LRC - system drive used at 100% - process identification needed

  • November 27, 2025
  • 1 reply
  • 1576 views

Dears - some time ago I've posted a similar topic, which as I thought was solved - but as it came out, not completelly. I still need your hep / support - as currently it is so annoying I'm thinking of changing the platform 😞 Sorry for the lenght of the thread - but everything needs to be as clear as possible 😞

 

In short words - the original thread is here 

https://community.adobe.com/t5/lightroom-classic-discussions/lrc-uses-100-of-system-drive-while-editing-makes-it-unsable-what-to-do/m-p/15488483

Just to be clear with sytem specs:

Windows 11

Ryzen 9 7950x

Radeon RX 7900xt

32GB RAM DDR5

System drive NvME 256GB Kingston - where LRC and PS are installed. about 70GB free disk space (new firmware installed)

Drive for RAW files, and a lrc catlogue is a separate SSD, connected via SATA (2TB Total), cache (100GB). So basically all oferations are done not on a system drive, but on a separate SSD drive.

All options of performance tab using GPU checked for full support.

LRC always at latest version - but the issue persists for several months already - so version doesn't change anything.

 

ISSUE is: During photoediting in lrc, the software freezes for 2-3s (randomly - when changing photo / adjusting exposure / while applying masks) - in general no role as of when, and why. During that freeze task manages shows sudden read / write operations on system drive (where the software is located), that takes up 100% system drive capacity - spikes that last for few seconds (task manager show 250-300 MB/s ssd read / write activity) - after which the usage goes back to 2-5% and the soft runs smoothly.

It was suggested that it might be spotify running in the background, or windos defender. But adjusting options / disabling did not solve the issue permanently - it still occurs.

 

THE DEVELOPMENT of finding the issue. I've installed "process explorer" to try to find the thread, or a process that runs during this issue. And althought I did not find out if there is any file read or wrote during the 100% drive usage, I found out, that along theese freezes there are 3 main dll files being suspicially overactive (they ofen pop out as CPU most active threads under lightroom.exe process freezes). Theese are:

ntdll.dll
uctrbase.dll
substrate.dll

Can it be, that theese libraries are the main cause of the issue? What are they responsible for - is it possible to identify a solution, based on theese 3 files activity?

Any help will be apreciated - if I can't solve the issue I am afraid I will switch to alternative software - as I can't work in such conditions. 😞

1 reply

Sameer K
Community Manager
Community Manager
November 27, 2025

Hey again, @Luke PhotoArt. I'll continue to help you figure this out. Great effort, investigation, and summarizing what you found. 

 

These are critical Windows OS components, so it may be an OS-level issue. A quick web search suggests methods to repair the OS image. Here is what I found to repair System Files

1 - Run the following commands in Command Prompt (Admin):

sfc /scannow

 

DISM /Online /Cleanup-Image /RestoreHealth

 

You'll find relevant help docs to troubleshoot and follow these steps on the internet. You'll have to approach this broadly. 

 

Also, try these steps in Lightroom Classic:

  • Lightroom Classic > Catalog Settings > Metadata > Uncheck 'Automatically Write Changes Into XMP.'
  • Check this detailed response from our Expert: https://adobe.ly/4g6Cb4j

Let me know how it goes. Thanks!

Sameer K

(Type '@' and type my name to mention me when you reply)

Known Participant
November 27, 2025
quote

Also, try these steps in Lightroom Classic:

  • Lightroom Classic > Catalog Settings > Metadata > Uncheck 'Automatically Write Changes Into XMP.'

Hi @Sameer K  - hope this time we can get it solved fully :

Just one question - I have this option already unchecked - shall I check it then?

Sameer K
Community Manager
Community Manager
November 27, 2025

If it is unchecked, we can proceed past it. You can go to File > New Catalog and use a new catalog to test if the issue exists. 

 

Thanks!

Sameer K