diff --git a/CMakeLists.txt b/CMakeLists.txt
index b2b54f4..5ac48c8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,6 +25,7 @@ add_executable(blah2
   ${PROJECT_SOURCE_DIR}/data/IqData.cpp
   ${PROJECT_SOURCE_DIR}/data/Map.cpp
   ${PROJECT_SOURCE_DIR}/data/Detection.cpp
+  ${PROJECT_SOURCE_DIR}/data/meta/Timing.cpp
 )
 
 add_library(ryml ${PROJECT_LIB_DIR}/rapidyaml-0.5.0/ryml-0.5.0.hpp)
@@ -65,3 +66,4 @@ include_directories("${PROJECT_SOURCE_DIR}/process/ambiguity/")
 include_directories("${PROJECT_SOURCE_DIR}/process/clutter/")
 include_directories("${PROJECT_SOURCE_DIR}/process/detection/")
 include_directories("${PROJECT_SOURCE_DIR}/data/")
+include_directories("${PROJECT_SOURCE_DIR}/data/meta/")
diff --git a/api/server.js b/api/server.js
index 8cb4e29..991a6e9 100644
--- a/api/server.js
+++ b/api/server.js
@@ -11,6 +11,7 @@ const HOST = '0.0.0.0';
 var map = '';
 var detection = '';
 var timestamp = '';
+var timing = '';
 var data = '';
 var capture = false;
 
@@ -36,6 +37,9 @@ app.get('/detection', (req, res) => {
 app.get('/timestamp', (req, res) => {
   res.send(timestamp);
 });
+app.get('/timing', (req, res) => {
+  res.send(timing);
+});
 app.get('/maxhold', (req, res) => {
   res.send(maxhold.get_data());
 });
@@ -59,7 +63,6 @@ const server_map = net.createServer((socket)=>{
         data = data + msg.toString();
         if (data.slice(-1) === "}")
         {
-          console.log('EOF');
           map = data;
           data = '';
         }
@@ -77,7 +80,6 @@ const server_detection = net.createServer((socket)=>{
       data = data + msg.toString();
       if (data.slice(-1) === "}")
       {
-        console.log('EOF');
         detection = data;
         data = '';
       }
@@ -93,7 +95,6 @@ const server_timestamp = net.createServer((socket)=>{
   socket.write("Hello From Server!")
   socket.on("data",(msg)=>{
     data = data + msg.toString();
-    console.log('EOF');
     timestamp = data;
     data = '';
   });
@@ -102,3 +103,20 @@ const server_timestamp = net.createServer((socket)=>{
   })
 });
 server_timestamp.listen(4000);
+
+// tcp listener timing
+const server_timing = net.createServer((socket)=>{
+  socket.write("Hello From Server!")
+  socket.on("data",(msg)=>{
+    data = data + msg.toString();
+    if (data.slice(-1) === "}")
+    {
+      timing = data;
+      data = '';
+    }
+  });
+  socket.on("close",()=>{
+      console.log("Connection closed.");
+  })
+});
+server_timing.listen(4001);
diff --git a/config/config.yml b/config/config.yml
index 5b495af..e1806ee 100644
--- a/config/config.yml
+++ b/config/config.yml
@@ -32,9 +32,11 @@ network:
     map: 3001
     detect: 3002
     timestamp: 4000
+    timing: 4001
 
 save:
   iq: true
   map: true
   detect: false
+  timing: false
   path: "/opt/blah2/"
diff --git a/config/radar4.yml b/config/radar4.yml
index 5473f12..b01bc03 100644
--- a/config/radar4.yml
+++ b/config/radar4.yml
@@ -9,7 +9,7 @@ capture:
 
 process:
   data:
-    cpi: 1
+    cpi: 0.5
     buffer: 1.5
     overlap: 0
   ambiguity:
@@ -32,9 +32,11 @@ network:
     map: 3001
     detection: 3002
     timestamp: 4000
+    timing: 4001
 
 save:
   iq: true
   map: false
   detection: false
+  timing: false
   path: "/blah2/save/"
diff --git a/src/blah2.cpp b/src/blah2.cpp
index d221608..ee47e83 100644
--- a/src/blah2.cpp
+++ b/src/blah2.cpp
@@ -13,6 +13,7 @@
 #include <IqData.h>
 #include <Map.h>
 #include <Detection.h>
+#include <Timing.h>
 #include <sys/types.h>
 #include <getopt.h>
 #include <string>
@@ -29,6 +30,8 @@ void signal_callback_handler(int signum);
 void getopt_print_help();
 std::string getopt_process(int argc, char **argv);
 std::string ryml_get_file(const char *filename);
+uint64_t current_time_ms();
+uint64_t current_time_us();
 
 int main(int argc, char **argv)
 {
@@ -93,28 +96,34 @@ int main(int argc, char **argv)
   fftw_plan_with_nthreads(4);
 
   // setup socket
-  uint16_t port_map, port_detection, port_timestamp;
+  uint16_t port_map, port_detection, port_timestamp, port_timing;
   std::string ip;
   tree["network"]["ports"]["map"] >> port_map;
   tree["network"]["ports"]["detection"] >> port_detection;
   tree["network"]["ports"]["timestamp"] >> port_timestamp;
+  tree["network"]["ports"]["timing"] >> port_timing;
   tree["network"]["ip"] >> ip;
   asio::io_service io_service;
   asio::ip::tcp::socket socket_map(io_service);
   asio::ip::tcp::socket socket_detection(io_service);
   asio::ip::tcp::socket socket_timestamp(io_service);
+  asio::ip::tcp::socket socket_timing(io_service);
   asio::ip::tcp::endpoint endpoint_map;
   asio::ip::tcp::endpoint endpoint_detection;
   asio::ip::tcp::endpoint endpoint_timestamp;
+  asio::ip::tcp::endpoint endpoint_timing;
   endpoint_map = asio::ip::tcp::endpoint(
     asio::ip::address::from_string(ip), port_map);
   endpoint_detection = asio::ip::tcp::endpoint(
     asio::ip::address::from_string(ip), port_detection);
   endpoint_timestamp = asio::ip::tcp::endpoint(
     asio::ip::address::from_string(ip), port_timestamp);
+  endpoint_timing = asio::ip::tcp::endpoint(
+    asio::ip::address::from_string(ip), port_timing);
   socket_map.connect(endpoint_map);
   socket_detection.connect(endpoint_detection);
   socket_timestamp.connect(endpoint_timestamp);
+  socket_timing.connect(endpoint_timing);
   asio::error_code err;
   std::string subdata;
   uint32_t MTU = 1024;
@@ -160,13 +169,20 @@ int main(int argc, char **argv)
     saveMapPath = savePath + ".map";
   }
 
+  // setup output timing
+  uint64_t tStart = current_time_ms();
+  Timing *timing = new Timing(tStart);
+  std::vector<std::string> timing_name;
+  std::vector<double> timing_time;
+  std::string jsonTiming;
+
   // run process
   std::thread t2([&]{
       while (true)
       {
         if ((buffer1->get_length() > nSamples) && (buffer2->get_length() > nSamples))
         {
-          auto t0 = std::chrono::high_resolution_clock::now();
+          uint64_t t0 = current_time_us();
           
           // extract data from buffer
           buffer1->lock();
@@ -178,30 +194,34 @@ int main(int argc, char **argv)
           }
           buffer1->unlock();
           buffer2->unlock();
-          auto t1 = std::chrono::high_resolution_clock::now();
-          double delta_t1 = std::chrono::duration<double, std::milli>(t1-t0).count();
-          std::cout << "Extract data from buffer (ms): " << delta_t1 << std::endl;
+          uint64_t t1 = current_time_us();
+          double delta_t1 = (double)(t1-t0) / 1000;
+          timing_name.push_back("extract_buffer");
+          timing_time.push_back(delta_t1);
 
           // clutter filter
           if (!filter->process(x, y))
           {
             continue;
           }
-          auto t2 = std::chrono::high_resolution_clock::now();
-          double delta_t2 = std::chrono::duration<double, std::milli>(t2-t1).count();
-          std::cout << "Clutter filter (ms): " << delta_t2 << std::endl;
+          uint64_t t2 = current_time_us();
+          double delta_t2 = (double)(t2-t1) / 1000;
+          timing_name.push_back("clutter_filter");
+          timing_time.push_back(delta_t2);
 
           // ambiguity process
           map = ambiguity->process(x, y);
-          auto t3 = std::chrono::high_resolution_clock::now();
-          double delta_t3 = std::chrono::duration<double, std::milli>(t3-t2).count();
-          std::cout << "Ambiguity processing (ms): " << delta_t3 << std::endl;
+          uint64_t t3 = current_time_us();
+          double delta_t3 = (double)(t3-t2) / 1000;
+          timing_name.push_back("ambiguity_processing");
+          timing_time.push_back(delta_t3);
 
           // detection process
           // detection = cfarDetector1D->process(map);
-          auto t4 = std::chrono::high_resolution_clock::now();
-          double delta_t4 = std::chrono::duration<double, std::milli>(t4-t3).count();
-          std::cout << "Detection processing (ms): " << delta_t4 << std::endl;
+          uint64_t t4 = current_time_us();
+          double delta_t4 = (double)(t4-t3) / 1000;
+          timing_name.push_back("detector");
+          timing_time.push_back(delta_t4);
 
           // output map data
           map->set_metrics();
@@ -216,9 +236,6 @@ int main(int argc, char **argv)
             subdata = mapJson.substr(i * MTU, MTU);
             socket_map.write_some(asio::buffer(subdata, subdata.size()), err);
           }
-          auto t5 = std::chrono::high_resolution_clock::now();
-          double delta_t5 = std::chrono::duration<double, std::milli>(t5-t4).count();
-          std::cout << "Output map data (ms): " << delta_t5 << std::endl;
 
           // output detection data
           // detectionJson = detection->to_json();
@@ -228,19 +245,30 @@ int main(int argc, char **argv)
           //   socket_detection.write_some(asio::buffer(subdata, subdata.size()), err);
           // }
           // delete detection;
-          auto t6 = std::chrono::high_resolution_clock::now();
-          double delta_t6 = std::chrono::duration<double, std::milli>(t6-t5).count();
-          std::cout << "Output detection data (ms): " << delta_t6 << std::endl;
+          
+          // output radar data timer
+          uint64_t t5 = current_time_us();
+          double delta_t5 = (double)(t5-t4) / 1000;
+          timing_name.push_back("output_radar_data");
+          timing_time.push_back(delta_t5);
 
-          auto t7 = std::chrono::high_resolution_clock::now();
-          double delta_t7 = std::chrono::duration<double, std::milli>(t7-t0).count();
-          std::cout << "CPI time (ms): " << delta_t7 << std::endl;
+          // cpi timer
+          uint64_t t6 = current_time_us();
+          double delta_t6 = (double)(t6-t0) / 1000;
+          timing_name.push_back("cpi");
+          timing_time.push_back(delta_t6);
+          std::cout << "CPI time (ms): " << delta_t6 << std::endl;
 
           // output CPI timestamp for updating data
-          auto t0_duration = t0.time_since_epoch();
-          auto t0_ms = std::chrono::duration_cast<std::chrono::milliseconds>(t0_duration).count();
-          std::string t0_string = std::to_string(t0_ms);
+          std::string t0_string = std::to_string(t0);
           socket_timestamp.write_some(asio::buffer(t0_string, 100), err);
+
+          // output timing data
+          timing->update(t0/1000, timing_time, timing_name);
+          jsonTiming = timing->to_json();
+          socket_timing.write_some(asio::buffer(jsonTiming, 1500), err);
+          timing_time.clear();
+          timing_name.clear();
         }
       }
     });
@@ -325,4 +353,18 @@ std::string ryml_get_file(const char *filename)
   std::ostringstream contents;
   contents << in.rdbuf();
   return contents.str();
+}
+
+uint64_t current_time_ms()
+{
+  // current time in POSIX ms
+  return std::chrono::duration_cast<std::chrono::milliseconds>
+  (std::chrono::system_clock::now().time_since_epoch()).count();
+}
+
+uint64_t current_time_us()
+{
+  // current time in POSIX us
+  return std::chrono::duration_cast<std::chrono::microseconds>
+  (std::chrono::system_clock::now().time_since_epoch()).count();
 }
\ No newline at end of file
diff --git a/src/data/meta/Timing.cpp b/src/data/meta/Timing.cpp
new file mode 100644
index 0000000..600de46
--- /dev/null
+++ b/src/data/meta/Timing.cpp
@@ -0,0 +1,103 @@
+#include "Timing.h"
+#include <iostream>
+#include <cstdlib>
+
+#include "rapidjson/document.h"
+#include "rapidjson/writer.h"
+#include "rapidjson/stringbuffer.h"
+#include "rapidjson/filewritestream.h"
+
+// constructor
+Timing::Timing(uint64_t _tStart)
+{
+  tStart = _tStart;
+  n = 0;
+}
+
+void Timing::update(uint64_t _tNow, std::vector<double> _time, std::vector<std::string> _name)
+{
+  n = n + 1;
+  tNow = _tNow;
+  time = _time;
+  name = _name;
+  uptime = _tNow-tStart;
+}
+
+std::string Timing::to_json()
+{
+  rapidjson::Document document;
+  document.SetObject();
+  rapidjson::Document::AllocatorType &allocator = document.GetAllocator();
+
+  document.AddMember("timestamp", tNow, allocator);
+  document.AddMember("nCpi", n, allocator);
+  document.AddMember("uptime", uptime, allocator);
+  rapidjson::Value name_value;
+  for (int i = 0; i < time.size(); i++)
+  {
+    name_value = rapidjson::StringRef(name[i].c_str());
+    document.AddMember(name_value, time[i], allocator);
+  }
+
+  rapidjson::StringBuffer strbuf;
+  rapidjson::Writer<rapidjson::StringBuffer> writer(strbuf);
+  writer.SetMaxDecimalPlaces(2);
+  document.Accept(writer);
+
+  return strbuf.GetString();
+}
+
+bool Timing::save(std::string _json, std::string filename)
+{
+  using namespace rapidjson;
+
+  rapidjson::Document document;
+
+  // create file if it doesn't exist
+  if (FILE *fp = fopen(filename.c_str(), "r"); !fp)
+  {
+    if (fp = fopen(filename.c_str(), "w"); !fp)
+      return false;
+    fputs("[]", fp);
+    fclose(fp);
+  }
+
+  // add the document to the file
+  if (FILE *fp = fopen(filename.c_str(), "rb+"); fp)
+  {
+    // check if first is [
+    std::fseek(fp, 0, SEEK_SET);
+    if (getc(fp) != '[')
+    {
+      std::fclose(fp);
+      return false;
+    }
+
+    // is array empty?
+    bool isEmpty = false;
+    if (getc(fp) == ']')
+      isEmpty = true;
+
+    // check if last is ]
+    std::fseek(fp, -1, SEEK_END);
+    if (getc(fp) != ']')
+    {
+      std::fclose(fp);
+      return false;
+    }
+
+    // replace ] by ,
+    fseek(fp, -1, SEEK_END);
+    if (!isEmpty)
+      fputc(',', fp);
+
+    // add json element
+    fwrite(_json.c_str(), sizeof(char), _json.length(), fp);
+
+    // close the array
+    std::fputc(']', fp);
+    fclose(fp);
+    return true;
+  }
+  return false;
+}
diff --git a/src/data/meta/Timing.h b/src/data/meta/Timing.h
new file mode 100644
index 0000000..6a60953
--- /dev/null
+++ b/src/data/meta/Timing.h
@@ -0,0 +1,58 @@
+/// @file Timing.h
+/// @class Timing
+/// @brief A class to store timing statistics.
+/// @author 30hours
+
+#ifndef TIMING_H
+#define TIMING_H
+
+#include <stdint.h>
+#include <vector>
+#include <string>
+
+class Timing
+{
+private:
+  /// @brief Start time (POSIX ms).
+  uint64_t tStart;
+
+  /// @brief Current time (POSIX ms).
+  uint64_t tNow;
+
+  /// @brief Number of CPI's.
+  uint64_t n;
+
+  /// @brief Time since first CPI (ms).
+  uint64_t uptime;
+
+  /// @brief Time differences (ms).
+  std::vector<double> time;
+
+  /// @brief Names of time differences.
+  std::vector<std::string> name;
+
+public:
+  /// @brief Constructor.
+  /// @param tStart Start time (POSIX ms).
+  /// @return The object.
+  Timing(uint64_t tStart);
+
+  /// @brief Update the time differences and names.
+  /// @param tNow Current time (POSIX ms).
+  /// @param time Vector of time differences (ms).
+  /// @param name Vector of time difference names.
+  /// @return Void.
+  void update(uint64_t tNow, std::vector<double> time, std::vector<std::string> name);
+
+  /// @brief Generate JSON of the map and metadata.
+  /// @return JSON string.
+  std::string to_json();
+
+  /// @brief Append the map to a save file.
+  /// @param json JSON string of map and metadata.
+  /// @param path Path of file to save.
+  /// @return True is save is successful.
+  bool save(std::string json, std::string path);
+};
+
+#endif