hiding a few rows with a macro takes forever

Folks,

My code snippet is attached below. Notes follow.

I am working on a range of less than 50 rows on a single worksheet. I have screenupdating turned off. Even so, this macro seems to take forever (in computer time). This is the only thing the macro is doing, so I think I may be using a poor choice of syntax. Any help would be appreciated. Thanks in advance.

Conor.

 For Each rw In Worksheets("User Dialog").Range("OrderQuantities").Rows
    
    If rw.Cells(1, 1) = "" Then
        rw.Hidden = True
    End If
Next

FYI - OrderQuantities is a named range one column x 45 rows

Use SpecialCells

On Error Resume Next 'prevent error if no cells are blank
 Sheet1.Columns(1).SpecialCells(xlCellTypeBlanks).EntireRow.Hidden = True
On Error GoTo 0