Why performance of Illustrator CS6 slower than Illustrator CS5.5?

Ex: Process get text of TextFrame has 657 characters:
Dim t1 As String
  Dim t2 As String
  t1 = DateTime.Now.Minute & " " & DateTime.Now.Second & " " & DateTime.Now.Millisecond
  Dim text As String
  For iChar = 1 To iCharNum
      oChar = oContents.Characters(iChar)
      Dim str As String
      str = oChar.contents.ToString
      text = text & str
  Next
  t2 = DateTime.Now.Minute & " " & DateTime.Now.Second & " " & DateTime.Now.Millisecond
Result:
Time of CS5.5: 0s 487
                         t1= 38 43 71
                         t2= 38 43 558
Time of CS6: 3s 871
                         t1=42 54 738
                         t2=42 58 609
Why performance of Illustrator CS6 slower than Illustrator CS5.5?
Can i set attribute increase performance of Illustrator CS6 ?

Hi, yes
CS5 - I run it several times, consistently getting 1 second
9/23/2014 22:00:09.000
9/23/2014 22:00:10.000
CS4 - the script finished immediately, super fast, in a fraction of a second
9/23/2014 22:07:20.000
9/23/2014 22:07:20.000

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