To achieve higher concurrency following logging levels should be set to ERROR.

To configure these properties:

  1. Login as admin user, go to Administer tab.
  2. Go to Setup and then click Application Settings
  3. Expand System and then Logging.
  4. Change the values of the properties as shown above.
  5. Save the configuration and restart Kernel and WebRunner.

Click here to know about different logging levels and behavior of the logger.