need help leaning or restructuring macro for highlighighting duplicates on large data

[estatefinds]

Option Explicit
Sub DupFinder()
    Dim R As Range, t As Range

    Set t = Range("C5:G16")
    
    For Each R In t.SpecialCells(xlCellTypeConstants).Cells
        If Application.WorksheetFunction.CountIf(t, R.Value) > 1 Then
            R.Interior.ColorIndex = 3
        End If
    Next
End Sub

The current code owrks but noticed when i ran it it would hang up and I could'nt even use ESC to interupt it. I need it to run leaner and faster on large data. I also noticed that it highlighted a Duplicate 1-1-1-1-14 when it saw another that was close to a duplicate but not a match to 1-1-1-1-11. It’s like it matched up to the first part of the last number.

The example i attached shows data in column C E G but the data im using is in columns C5:G324632. dis regard data in column E.


if possible a macro that works when I enter a range to find (highlight duplicates in red) duplicates.

any help on this is appreciated
Sincerely,
Dennis