Sub test2()
Dim i As Long, j As Long
Application.ScreenUpdating = False
With Feuil1
For i = 1 To .Range("E65536").End(xlUp).Row
For j = 1 To 100
Worksheets("Feuil1").Columns(j).Replace _
What:=Feuil2.Cells(i, "A").Text, Replacement:=Feuil2.Cells(i, "B").Text, _
SearchOrder:=xlByColumns, MatchCase:=True
Next j
Next i
End With
Application.ScreenUpdating = True
End Sub