1) GUICtrlCreateListViewItem() - very quick
2) _GUICtrlListView_AddItem(ControlId) - MUCH slower
3) _GUICtrlListView_AddItem(ControlHwnd) - even MUCH more slower
I think 1) and 2) should have similar time consume amount and not such big differences.
I saw it's sources.
Times in parenthesis are from another computer.
All times are avg from several runs (all on 3.2.10 version)
$gui = GUICreate("listview it