This is probably my 10th attempt to move from pgadminIII to pgadmin4. At least the performance has significantly improved over time and seems now acceptable.
The biggest drawback is however that all elements are locked up in one browser window – I cannot find any option to detach a query windows and put it on a different monitor.
Opening Query tool or Debugger window in a new separate browser window is configurable option in pgAdmin4, Goto
File -> Preferences -> Query Tool -> Display -> Open in new browser tab
Set it to: True
File -> Preferences -> Debugger-> Display -> Open in new browser tab
95% of my time I use pgadminIII just to type select and update statements and review the output rows.
I know that I can do this in psql but it’s not handy with many columns.
For that reason we currently stay with pgadminIII (and this is for us also one of several reasons to delay any move from 9.6 to a more recent version).