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

It looked like the same problem, and when I went to delete the metrics file it was there again, and deleting it a second time allowed lightroom classic to open (I did nothing else).  I note that LRC is stuck on syncing 4 photos again so I'll try pausing the syncing rather than force quitting again and see what happens. 

@Tessa288894707bf6  It is not necessary to remove the metrics.json file more than once. It also does not affect syncing. You likely have a different issue and should start a new thread. 

Deleting the metrics.json file worked for me.  BUT LRClassic then got 'stuck' syncing 4 photos so I had to force quit.  And the next time I tried to open it - same thing.  Deleted  the metrics.json file again, but this is going to be really painful if I have to go through this on a regular basis!

I have a mac pro Monterey 12.6.4- all updates

Mac Pro (Late 2013)

3.5 GHz 6-Core Intel Xeon E5

16 GB 1866 MHz DDR3

AMD FirePro D500 3 GB

adobe cloud all updated 

I have had the adobe cloud with photoshop and lightroom for years and have never had issues untill out of the blue, today.

I have uninstalled, reinstalled light room classic, signed in and out of my adobe cloud account, deleted the preferences, started and restarted the computer...

Did I delete the preferences needed? if so where do I find those because uninstalling and reinstalling didn't help.. 

A few weeks ago I intalled lightroom CC, I didnt open lightroom classic since then. So I uninstalled both, thinking one was causing issues. 

The lightroom classcic seems like its starting but the little circle just swirls, I check the app and it says not responding.. 

please help..I have work to do!

Oi!

acabei de comprar um notebook novo, usava um lenovo e migrei para um macbook air m1 2020 (OS ventura 13.3 - 8gb de ram - 256gb).

ontem instalei o lightroom, tudo correu normal, até eu precisar fechar o app e ele nao encerrar direito, precisei forcar o encerramento, apos isso fechei o macbook e ao tentar abrir essa manha o lr nao funcionou mais!

ele simplesmente fica na tela inicial e nao carrega, nao inicia, nao abre.

ja desinstalei e instaleu tudo, incluindo o creative cloud e nada resolveu.

nao achei nada na internet parecido com isso.

When I try to start Lightroom Classic 12.2.1 on my iMac (2019, 48 GB Memory, 1 TB HD about 50% used, Ventura 13.2+13.3), the program takes about 3 hours to start. Starting time does not depend on catatlog used. My catalog files are located in folders named "~/Pictures/History.20XY" 

The last time I could start the program normally a catalog was opened that is setup to synchronise collections with adobe cloud storage to allow access by Lightroom Mobile/iPad. When I changed the catalog in the UI, the subsequent starting took so long that I stopped program. After that incident any starting attempt eventually succeeds but takes 2-3 hours.

I tried to 1) re-login in Adobe Account (Foto subscription), 2) de-installed and re-installed LR CC, 3) Opened LR CC while holding Shift + Options and selected to use new settings but nothing helped

@Howsiett Thank you. We did already obtain a file from another customer. 

Did you get an example of the metrics.json file?  If you need I can supply.

Just want to say that this is working for me, thank you. I had LR running on a new profile (Win11) and as soon as I ran a new photo import I started having the same startup issues. Once I deleted the metrics.json file I was able to get LR to load on both profiles (deleting the file under each user account).

So could I, I could even use light room but classic would crash. 

the only give away was when starting up the laptop screen would go black for a couple seconds after it started up