Unresponsive when opening previous catalog

I made a new catalog in lightroom and wanted to open my previews catalog which tells me it needs to be updated to the current LR version. After resuming Lightroom starts to open but turns unresponsive after a while and I have to force to stop the program. 

I know my older catalog is pretty big ( didn't understand I should make new ones frequenly) But I never had problems making backups and even transfering and opening it, till today after setting up a new catalog.

I have the current LR classic version on Windows 11