Performance Profile allows Tempo support team to analyze performance-related problems on your JIRA server without direct access to it.
We are using Java Profiler product called YourKit. In order to collect the profile, you'll need to download freely distributed "agent" library, connect it to your JIRA instance and capture a performance snapshot. You will need to purchase a license from YourKit only if you want to analyze the captured profile yourself.
No special knowledge is required to collect the performance profile, but being familiar with using the command-line on the server that runs JIRA helps.