Looking to make this macro Faster

Code:

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Sub STEP12()  Dim wb1 As Workbook, ws1 As Worksheet, Lr1 As Long
  Set wb1 = Workbooks.Open("C:\Users\WolfieeeStyle\Desktop\HotStocks\1.xls")
  Set ws1 = wb1.Worksheets.Item(1)
  Let Lr1 = ws1.Range("H" & ws1.Rows.Count).End(xlUp).Row
  ws1.Range("J2:J" & Lr1 & "").Value = "=IF(H2>D2,0.40/100*H2,IF(H2<D2,0.40/100*H2,""D is equal to H""))"
  ws1.Range("J2:J" & Lr1 & "").Value = ws1.Range("J2:J" & Lr1 & "").Value
  ws1.Range("K2:K" & Lr1 & "").Value = "=IF(H2>D2,H2-J2,IF(H2<D2,H2+J2,""D is equal to H""))"
  ws1.Range("K2:K" & Lr1 & "").Value = ws1.Range("K2:K" & Lr1 & "").Value
  wb1.Save
  wb1.Close
End Sub

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Let is redundant: Lose it
& "" Does nothing: Lose them
IF(H2>D2 & IF(H2<D2 Used together like that mean H2<>D2: Use a single IF Statement.
0.40/100 = 0.04%" Are you sure that's what you want? If so. just use 0.0004*H2

To really speed up that code, use Arrays for D, H, J, & K, then do all processing in memory before "pasting" J & K back into the sheet