Debugging Template Tags
By setting the DebugMode to a value of 8, you can get some performance information about your template tags. These messages get sent to your web servers error log or STDERR. He is some sample output:
Builder: Tag [Assets] - 12.007559 seconds
Builder: Tag [Tags] - 0.877185 seconds
Builder: Tag [If] - 0.877515 seconds
Builder: Tag [Include] - 1.063821 seconds
Builder: Tag [Else] - 1.064076 seconds
Builder: Tag [If] - 1.064391 seconds