F4 on object type is slow

When I want to see a describe of an oracle object type, it takes 30 seconds.

I found that the following select is slow:

  SELECT M.Type_name,
         M.Method_Name,
         M.Method_No,
         M.Method_Type,
         r.Type_Name,
         r.Method_Name,
         r.Result_Type_Mod,
         r.Result_Type_Owner,
         r.Result_Type_Name
    FROM DBA_TYPE_METHODS M, DBA_METHOD_RESULTS r
   WHERE     (M.type_name = :ObjName)
         AND (M.Owner = :Owner)
         AND (r.Type_name(+) = M.type_name)
         AND (r.method_name(+) = M.method_name)
         AND (r.method_no(+) = M.method_no)
         AND (r.Owner(+) = :Owner)
ORDER BY M.method_name

What can I do to improve this?

Fyi: I tried Hint Rule: it would really improve this statment.
So I added both tables in the oracle hint table (in the Toad options->Oracle->Optimizer Hints), but the hint was not used by the query.

I use Toad 11.5 (it was already slow in older versions of toad) and Oracle 11.1.0.7

Thanks,
Patrik