Becky Nurse of Salem is a play in constant motion. Playwright Sarah Ruhl has concocted an elixir of comedy, melodrama and a touch of the unreal in her look at Becky, a working-class Massachusetts woman dealing with job, health, and family woes: in other words, life. “The world is so loud,” Becky says early in the show.

While more restrained than plenty of other Ruhl works, she still throws in a few too many disjointed references, including opioid addiction and Hillary Clinton. What does ground this show? No surprise, star Deidre O’Connell as Becky. The world may be loud, but she is pitch perfect.