You can use /nolagg examine to examinate the server for a set amount of ticks. (default 500)

The results will be exported in this folder (NoLagg/logs)
To view the results, open the file using 'ExamReader.jar'
This program can render the graphs contained in the exam file values.

If you have tick rate issues and need to understand why, you can examine the server.
If you don't understand the graphs yourself, feel free to upload the file so I can view it locally.

- Bergerkiller