Sorry, in that case you aren't using Access: you're using ADO.Net to read a
Jet database. I believe you'll find that Access (i.e. msaccess.exe) is not
running while your application is running. In actual fact, there's no need
to have Access installed on the server.
AFAIK, msaccess.exe can't take advantage of dual processors. I would assume
that ASP.Net and IIS can, but can't comment whether that would make any
difference in your scenario.