Alamofire，响应处理程序性能问题

Question

我正在为我的应用程序进行性能测试，在通过仪器进行调试后，我遇到了请求问题。我为每个人使用DispatchQueue，并通过DispatchGroup对其进行分组。有人可以看看并指出我在哪里犯错误吗？

这是responseHandler：

func responseHandler(dataResponse: DataResponse<Data>, completion: @escaping (Data, NetworkCode) -> Void) {

        guard (dataResponse.response?.statusCode) != nil else { completion(Data(), .error); return }
        guard Connectivity.Instance.isReachability else { completion(Data(), .noInternetConnection); return }
        // Response must be different than 401 - 401 code means we fucked up request.
        if dataResponse.response?.statusCode == 401 {
        // TODO: Handle message from server.
            completion(Data(), .error)
            return
        }
        // Return data from resonse if everything went ok ( status code 200 )
        guard let data = dataResponse.data else { completion(Data(), .error); return }
        completion(data, .success)
    }

我基本上检查了请求状态代码和互联网连接。

队列：final let queue = DispatchQueue(label: "com.cnoon.response-queue", qos: .userInitiated, attributes: .concurrent)

电话：

//创建调度组。

            let group = DispatchGroup()

            // Get first data.
            group.enter()
            let queryParams = self.buildQueryParams(requestType: .getFirstData(token))
            self.firstRequestWith(queryParams, completion: {
                // Here is a createRequest method call - inside firstRequestWith
                print("1 request")
                group.leave()
            })

            // Get second data.
            group.enter()
            let queryParams = self.buildQueryParams(requestType: .getSecondData(token))
            self.secondRequestWith(queryParams, completion: {
                // Here is a createRequest method call - inside secondRequestWith
                print("1 request")
                group.leave()
            })

            group.wait()

            group.notify(queue: .main, work: DispatchWorkItem(block: {
                print("Main")
            }))

buildQueryParams方法返回[String: AnyObject]类型的字典。

我是否理解多线程Alamofire请求？

提前致谢！