To maximize the reach of your journeys, the Path Optimizer undertakes an action to generate a winning path. During an active journey, you can test alternative versions of messages, wait times, channels, and message frequency on a subset of your contacts. Alternatively, depending on information recorded both in and out of Marketing Cloud, you could choose a winner manually at any time. Also, even if a journey is halted, the test continues. When a journey is interrupted, no connections are processed for transmitting messages. Therefore, the activity's capacity to select the winning path gets hampered.