Sub Masquer_videsBis()
Dim dl&: dl = Cells(Rows.Count, 1).End(3)(-2).Row
Application.ScreenUpdating = 0
With Range(Cells(4, "L"), Cells(dl, "L"))
.FormulaR1C1 = "=IF(COUNTA(RC[-10]:RC[-1])=0,""X"",0)"
Application.Calculation = -4135
.Value = .Value
.SpecialCells(xlCellTypeConstants, 2).EntireRow.Hidden = True
End With
Columns(12) = Empty
Application.Calculation = -4105
Application.ScreenUpdating = -1
End Sub