Thanks Joe, "Your test is likely invalid because the internal drive "

But Joe, the test Mac HD is not essentially clean install; it is a clean install! Since I have to much space, I'm able to create a Mac HD clean install, while not erasing anything. (ie while being able to go back later to the normal Mac HD which got the migration from the 27")

So remember, I don't have a USB 2.0 drive — even the 5 years old Seagate is USB.. The 10 port hus is also USB 3, Only USB 2 is mouse, card reader etc.

TM could be the cause: But I did not have all beachballing on 27" and had TM going...

BTW Joe, I do notice that older Seagate does seem to beachball a bit more than the other drives, just by clicking on it even though is get 99% oten in Drive X. Weather it's on its "own netword" ie plugged in back of the machine or the hub. Now if something on it, "own network" as you say, that should not effect anything else right.

Also noticed today a beachball a bit while in Excel, which I would not see on the 27" on Excel.

Last edited by kevs; 09/02/22 11:26 PM.