You’ve made me realise that something was wrong with the loop.
How the loop was working ?
It selected one property, then copy it, then selected the group where I want to paste it, then past it.
And it was looping 50 – 100 times, so it was extremely slow.
But now all it’s fine, what the loop is doing ?
It only selects all the properties.
Then outside of the loop, the script copy the selected property in one go, then select the group, then past it.
It is now very fast, the problem is resolved !
Thank you very much Dan Ebberts, without you I don’t think that I would have realised the problem 😃