Same problem here. Takes ages to load. 2022.3.7
Found a workaround but it’s dumb as hell. Swap the package manager to “Unity Registry” instead of your assets.
Then swap back to “My assets”. If doesn’t work on the first time close package manager, then re-open.
I think what happens is the package manager starts the loading/refresh cycle and doesn’t stop it after actually loading the data and being ready to display it.
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I had the same issue in a new project setup in 6000.0.18. I noticed it occurred after I enabled parallel asset import in the editor settings. Disabling this fixed the problem for me.