Transaction Net Server Time Percentile report

This report shows the 85th, 90th, and 95th percentile net server times for all users and the union of all transactions in a run. The report also shows the 10 slowest transactions in a run. The net server time corresponds to the cumulative server response times within a transaction. Net server time does not include think times and delays, which are included in the elapsed time.

The default percentiles in this report, 85th, 90th, and 95th, are sufficient for most purposes. However, if you must report on a different percentile set, click Window > Preferences > Test > Percentile Analysis Targets to change the percentiles in this report and in the Page Percentile report.

The Summary page of this report has a graph with three bars, which represent the 85th percentile, 90th percentile, and 95th percentile net server times for all users and for all transactions in the run. For the 85th percentile bar, 85% of all users achieved the indicated net server time or better. For the 90th percentile bar, 90% of all users achieved the indicated net server time or better. And for the 95% percentile bar, 95% of all users achieved the indicated net server time or better.

The 85%, 90%, and 95% pages show the net server time percentiles of the 10 slowest transactions in the run. For example, if you click the tab for the 85th percentile, and the total for a transaction is 110 (the total is beneath each bar), you know that 85 percent of the net server times for that transaction are less than or equal to 110 milliseconds (ms).

This graph provides an overall idea of the net server times for each transaction. For example, the Transaction report might indicate that a login transaction is one of the 10 slowest transactions. However, it is possible that only one instance of the login transaction was extremely slow while the other instances of the login transaction were within acceptable range. The Transaction Net Server Time Percentile report shows which transactions have slow net server time averages because they were slow in general, not because a few net server times (out of many) were extremely slow.

The table beneath the graph provides more detailed information for each transaction:

  • The minimum net server time for the run.
  • The average net server time for the run.
  • The standard deviation of the net server time. The standard deviation tells you how tightly the data is grouped about the mean.
  • The maximum net server time for the run.
  • The 85th percentile for the run. That is, for this particular transaction, 85% of the net server times were equal to or faster than this time.
  • The 90th percentile for the run. That is, for this particular transaction, 90% of the net server times were equal to or faster than this time.
  • The 95th percentile for the run. That is, for this particular transaction, 95% of the net server times were equal to or faster than this time.
  • The number of attempts in the run.