Macro Optimization And Moving Text From One Column To Another And Deleting Previous Column

I am running Win XP and Excel 2003.

I have a macro I found here on the boards written by Lenze to delete an entire row based on what is found in column A. I would like to delete any row where Col. B contains 10 or less characters and I have modified it to do so (or at least I think it does). My problem is that it takes about 12 minutes to run the macro (I have about 50k lines to run through). I was wondering if this is the fastest method or if it examines things other than just column B.


Sub Test()
Dim i As Long
LR = Cells(Rows.Count, "B").End(xlUp).Row
For i = LR To 2 Step -1
If Len(Cells(i, "B")) < 11 Then Cells(i, "B").EntireRow.Delete
Next i
End Sub
After this runs, I am left with Columns A to somewhere around AH. The columns are generally in the format of text followed by a numeric column. An individual text column has the same name through all of the rows. The numeric columns have varied values whether negative or positive.
Ideally what I would like: If a given cell (ie. C2) in Row 2 is numeric, then copy the cell to the left (ie. B2) into (ie. C1) and then delete Column B. I need this to work for multiple columns from B to C, skip D and E, and then from F to AG (and maybe beyond).