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

Thank you. I updated my app. Waiting to see if the experience improves. I have a feeling the metrics.json file was filling up because of some cloud syncing I've been trying to let complete. The cloud sync is really slow. It's been going on for days now, and I literally can't do anything in Lightroom while it's syncing or the whole app crashes. I have to pause the sync, do my work, then un-pause and let my computer churn while I'm away from it. The Cloud Sync alone is my number one contribution to Global Warming.

And they even base64 encoded the entire metrics.json file, which makes it 25% larger than it would otherwise be. Winning strategy.

@rptmaestro2  The fix was released on April 17th.  See the second pinned post on this thread. 

I have to delete ~/Library/Cache/Adoby/Lightroom/metrics.json every day because of this bug. Every time I see the file, it's crazy huge. As a software engineer of 26 years, I can only assume a very junior engineer came up with the idea of dumping hundreds of gigabytes into a single JSON file. I'm extremely disallusioned with how poor Adobe's quality is for the high price I pay each month. My catalog is already huge. Why would I want adobe to capture hundreds of gigabytes of metric data in addition to all the other space my catalog is taking up? What the heck does Adobe think it's going to do with all that metric data? How does it think it's going to improve my experience, and how did this ever make it past quality control? And why does it take so long to get a fix release? On top of Lightroom's already terrible performance, this is the last straw for me. I've cancelled my subscription.

This bug is pretty crazy. Lightroom created a 152 GB metrics.json file. Where was the logic in that? Are they dumping my entire catalog to JSON?

I've given up on this update and reverted abck to the previouis version of LR. I'll wait for the next upgrade and hope they have addressed the issue. Thanks for oyur replies to my concern!!

@Taaniel2389607029pe it's great isn't it? And nobody from Adobe is taking this seriously at all it seems. No taking responsibility from their side. [moderator edit for foul language]

12.3 on Ventura 13.2.1 still crashes even after multiple restarts and deleting the metrics.json file. Fabulous work breaking the app that has always worked!

This does nto work for me.  I have tried unitstalling multiple versions of LR Classic.  Did the process outlined below.  Never saw the metrics.json.  But see a js file.  I deleted that.

My issue of LR Classic not starting up ccored right after using Illustrator for the first time a few days ago.

Using a one year old Lenova.  Windows 11.

Not a technical person, so this is a struggle.  As well as costing me money not getting to use LR now.    PLEASE HELP!  Thank you.