public static DelayPostprocessor getMediumPostprocessor() {
    if (sMediumPostprocessor == null) {
      sMediumPostprocessor = new DelayPostprocessor(10);
    }
    return sMediumPostprocessor;
  }
This is a Postprocessor which just introduce a delay
samples/scrollperf/src/main/java/com/facebook/samples/scrollperf/postprocessor/DelayPostprocessor.java