After running the below marco, i've found the reponse is too slow whenever
any reqeusts, such as Zoom, hide/view comment, autofilter. Pls help....

Sub Comments_AutoSize()
'posted by Dana DeLouis 2000-09-16
Dim MyComments As Comment
Dim lArea As Long
For Each MyComments In ActiveSheet.Comments
With MyComments
.Shape.TextFrame.AutoSize = True
If .Shape.Width 300 Then
lArea = .Shape.Width * .Shape.Height
.Shape.Width = 200
' An adjustment factor of 1.1 seems to work ok.
.Shape.Height = (lArea / 200) * 1.1
End If
End With
Next ' comment
End Sub