Don't forget to enable Load Testing in your Etherpad
Basic Load Test Example
Specify the Etherpad instance
Test Specific Etherpad Instance for 60 seconds
etherpad-loadtest http://127.0.0.1:9001 -d 60
Test a specific Pad
50 Lurkers, 10 authors
etherpad-loadtest http://127.0.0.1:9001 -l 50 -a 10
-l number of lurkers.
-a number of active authors.
-d duration in seconds to test for. Default is unlimited.
Basic load test will increase # of lurkers and authors every 5 seconds until changesets are stopped processing in a timely fashion. At this point the # of lurkers and authors tells the admin how many people could use their instance. Roughly. Take into account as documents grow they have heavier computing costs.
You should modify your tests to your use case.