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TAdvSmoothListBox
Adding many items to the list fast

To add many items to the TAdvSmoothListBox, the use of BeginUpdate / EndUpdate will significantly accelerate this:
var
  i: integer;
begin
   AdvSmoothListBox1.Items.BeginUpdate;
   for i := 0 to 1000  do
   begin
     AdvSmoothListBox1.Items.Add.Caption := 'item '+ inttostr(i);
   end;
   AdvSmoothListBox1.Items.EndUpdate;
end;