This tests the connection-speed of the server to the selected datasource. The selected datasource must be a real JDBC Datasource supporting SQL. The server will send queries with data to the database which then returns some result, measuring the time of the roundtrip. The test displays how much data was transferred on average. A low bitrate means the network between server and database is too slow and/or the database is too busy with other stuff to answer the requests fluently. You need to check whether/why the database is busy and/or why the network is so slow.