Looking for suggestion on how to change the following as required,
to greatly improve speed of operation.
Without the following: about 5-6 seconds
WITH the following: about 30 seconds.

Dim LastRow As Long
Application.ScreenUpdating = False
LastRow = ActiveSheet.Cells(Rows.Count, "B").End(xlUp).Row
For RowNdx = LastRow To 1 Step -1
If Cells(RowNdx, "B").Value = "x" Then
Rows(RowNdx).Delete
End If
Next RowNdx