VBA oledb open connection became slow

Question

In my VBA project the opening of the OLEDB-connection has become really slow.
(In the past it worked fast but since some months it has become slow.)

It takes 13 seconds to just open the connection.

I have tried this with only this coding in my project and only 1 row of data in my excel-sheets so there is no issue regarding big data or complex querying.

This is my code :

Sub ShowData()

Dim connection As New ADODB.connection

'Opening connection

connection.Open "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" & ThisWorkbook.FullName & _

";Extended Properties=""Excel 12.0;HDR=YES;"";"

'Closing connection'

connection.Close

End Sub