See the MDN page for more information, including how to use peptest and write tests for it.
Peptest statistics for try, mozilla-inbound, and mozilla-central are available at http://mrcote.info/peptest/
bug 737886 Set up reporting when significant deviations occur in buildbot's peptest results. Since we can't develop a simple pass/fail result, developers will have to rely on these reports to determine when responsiveness has gotten worse (or better).
bug 740462 Capturing telemetry information would be useful in diagnosing causes of responsiveness. Results would be available after running a test, and by clicking through on the stats UI.
Integration with SPS
Note: this will likely be put on hold indefinitely until the status of e10s becomes more clear
Mozmill doesn't use MessageManager when it interacts with content. This means that it will not work correctly with Electrolysis builds (which is mostly the entire point of Peptests). Mozmill will need to be refactored to use MessageManager and also to stop using the gBrowser object which doesn't exist in mobile Firefox.