The ODBC Tracing option is turned on. You can cross-check whether this option is not turned on by following the instructions from here.

As shown in the above image, the 'When to trace' option from the ODBC Data Source Administrator 'Tracing' tab should always point to 'Start Tracing Now', instead of 'Stop Tracing Now'.

The Debug version of the driver is used. If you are using the debug version of the driver DLL, it can also relatively slow down the query processing time. You can cross-check whether you are using the debug or release version of the DLL from the 'Comments' section of the driver DLL properties (from the system directory, right click on the driver DLL and click on properties) as shown below:

The Driver trace and query logs are enabled. Even if you intent to use the debug version of the driver (you should always use the release version in the production environment), make sure the driver trace and query log options(OPTION=4,524288 respectively) are not enabled as shown below: