What is the use of “waitForQuiescence” capability?

Turn on/off waiting for application quiescence in WebDriverAgent, while performing queries.
     Quiescence has to do with WebDriverAgent deciding that your app is idle and automation can resume. 
     If an iOS session hangs, turning this off could help.
     Default is true.
      Eg:-capabilities.setCapability("showChromedriverLog", true);