We would like to add better performance testing for measuring the speed of planned replica set failovers using replSetStepDown. This includes testing the following:

1. The amount of time between when an old primary is able to accept writes and when a new primary is able to accept writes.
2. The amount of time between when an old primary is able to commit majority writes and when a new primary is able to commit majority writes.

We should test these scenarios with chaining enabled and disabled.