Akka Http JSON序列化非常慢

case class Response(msg: String)
implicit val format = jsonFormat(Response)


def logMagnet()(t: LoggingAdapter): HttpRequest => RouteResult => Unit = {
    request => {
      val startTime = System.currentTimeMillis()
      response => {
        val total = System.currentTimeMillis() - startTime
        logger.info("took $total")
      }
    }
  }

val route = logRequestResult(LoggingMagnet(logMagnet())) {
   val start = System.currentTimeMillis()
   val calculateSomethings = ....
   val duration = System.currentTimeMillis() - start
   val response = Response("took $duration to calculate")
   complete(response)
}

对于琐碎的序列化,记录到响应之间的时间通常为3-4毫秒。