When properties pane "fetches data" to populate certain sections (Parents & Siblings), properties refresh is very slow.
A value of "1" in any of these 2 sections will tremendously slow down the item to item focus change.
Parents: 1
AND/OR
Siblings: 1
It gets worst with higher values.
30-50 siblings or parents will create about a 1-2 s disruption for the properties pane to refresh and "release the focus" to the next item... which makes navigation with an opened properties pane almost impossible.
30-50 seems like a big number, but it isn't actually. E.g.