P: Sky Replacement tool Very Slow and unusable.

I am having real problems using the Sky Replacement tool.  I am using a Mac with the M1 processor.  The same problem is also happening on my Mac Book Pro with a similar spec.  I open the tool and you get the spinning wheel, trying to select different skies just freezes.  I have deleted all the photoshop permissions and made sure that the program has all the necessary disc permissions that I saw in a previous post.  Any ideas?