P: LrC 12.2.1 fails to start/launch or is extremely slow launching.

I have had this problem intermittently with Lightroom Classic - just launches as a background process using significant amounts of RAM and CPU, but the visible window never shows up. I don't have a metrics.json on my Win 10 desktop having check all my drives, not just the directory listed. Is this because I don't allow metrics to be sent back to Adobe?

I have simply opened Task Manager & ended the Lightroom task. Lightroom then opens normally.

Hi, thank you for the workaround, but I can't even find the metrics.json file.

Do I understand it correctly that when there is an update released, this will be fixed automatically, and I can launch Lightroom again ? I'm not an IT wizard and not keen on trying all these options I read on here (since I can't just locate the specific file). Or will it take a long time until an update to fix this is released ?

Many thanks for your reply. 

Hi all,

On mac OSX 12+ lightroom is taking a VERY, VERY long time to load.

I have rebooted several times even in safe mode before going back to normal mode. 

I see the first loading screen then is disappears. Adobe, HELP PLEASE !!

I will delete the above mentioned file to see if it speeds up. 

Kevin in France

For me it seems to related to leaving folders expanded before closing LR. If I close lightroom with all drives collapsed it opens fast the next time. If I leavr the folder structure expanded I pay the price ...

The workaround works for me.

Thankyou.

David

"Where did you find this file. I've looked on my iMac and can't find it."

See here for the complete set of steps of working around this problem:

https://community.adobe.com/t5/lightroom-classic-bugs/p-lrc-12-2-1-fails-to-start-launch-or-is-extremely-slow-launching/idc-p/13695275/page/6#M41952

See the pinned reply at the top for the file's location:

https://community.adobe.com/t5/lightroom-classic-bugs/p-lrc-12-2-1-fails-to-start-launch-or-is-extremely-slow-launching/idc-p/13680800/page/4#M41624

Be sure to exit LR before looking for the file. If it's not at that location, and your LR is slow to start or refusing to start at all, then you probably have a different issue and should start a new thread.

Where did you find this file. I've loooked on my iMac and can't find it.

@DdeGanneswrote, "What purpose does the " metrics.json file " have and is it a file that is created by Apple operating system?"

The file is created by LR and records stats about your usage of LR that are sent back to the developers. That reporting is controlled by your Creative Cloud account option Share Information On How I Use Adobe Desktop Apps, which is on by default:

https://www.adobe.com/privacy/app-usage-info-faq.html 

Such information is invaluable at helping the product developers understand how LR is actually used.

See here for some more technical details about that file:

https://www.lightroomqueen.com/community/threads/lrc-cache-causing-crash-metrics-json-but-why.47409/#post-1313861

"the solution works on my Mac only one time. After the next start the same, vnow response from LR."

Try turning off the Creative Cloud option Share Information On How I Use Adobe Desktop Apps, as detailed here:

https://community.adobe.com/t5/lightroom-classic-bugs/p-lrc-12-2-1-fails-to-start-launch-or-is-extremely-slow-launching/idc-p/13676909#M41605

Hi Rikk,

the solution works on my Mac only one time. After the next start the same, vnow respoce from LR.