Aquiring datasource connections in JBoss EAP 6

Issue

• The following code snippet is from SLSB. It has found that it takes a considerable amount of time to retrieve a database connection (150ms).
• Why this is happening? It need to speed this up considerably. How can to speed this up?

@Stateless
public class TestDAO implements TestDAOLocal{

    @Resource(mappedName = "java:/TEST_DS")
    private DataSource testDs;

    private String insertSQL = "insert into test_table (a, b, c, d, e, f) values (?, ?, ?, ?, ?, ?)";

    private static Logger logger = Logger.getLogger(TestDAO.class);



    @Override
    public void add(TestLog testlog) {
        logger.debug("Add method entered");
            Connection conn = null;
        try {
         //HERE IS WHERE THE SLOWDOWN IS
            conn = testDs.getConnection();
            logger.debug("got a connection");
            PreparedStatement pstmt = conn.prepareStatement(insertSQL);
            pstmt.setString(1,testlog.getA());
            pstmt.setDate(2, new Date(new java.util.Date().getB()));
            pstmt.setString(3, testlog.getC());
            pstmt.setString(4, testlog.getD());
            pstmt.setLong(5, 100);
            pstmt.setString(6, testlog.getF());

            long queryTimeinMillis = 0;
            if (logger.isDebugEnabled()) {
                queryTimeinMillis = System.currentTimeMillis();
            }
            logger.debug("calling insert");
            pstmt.executeUpdate();
            if (logger.isDebugEnabled()) {
                queryTimeinMillis = (System.currentTimeMillis() - queryTimeinMillis);
                logger.debug("Request Message recorded in " + queryTimeinMillis + "ms");
            }
        }
        catch(Exception e){
             try {
                conn.close();
            } catch (Exception se) {
                //do nothing
            }
            logger.warn(StringUtil.getStackTraceString(e));
        }

    }