diff --git a/libnethogs.cpp b/libnethogs.cpp
index b6125df..9bd13a5 100644
--- a/libnethogs.cpp
+++ b/libnethogs.cpp
@@ -7,6 +7,7 @@
 #include <atomic>
 #include <memory>
 #include <thread>
+#include <map>
 
 //////////////////////////////
 extern ProcList * processes;
@@ -17,8 +18,11 @@ extern Process * unknownip;
 
 static std::shared_ptr<std::thread> monitor_thread_ptr;
 static std::atomic_bool monitor_thread_run_flag(false);
+
 static NethogsMonitor::Callback monitor_udpate_callback;
-static NethogsMonitorData monitor_data;
+
+typedef std::map<int, NethogsAppUpdate> NethogsAppUpdateMap;
+static NethogsAppUpdateMap monitor_update_data;
 
 bool NethogsMonitor::_trace = false;
 bool NethogsMonitor::_promisc = false;
@@ -106,7 +110,7 @@ void NethogsMonitor::threadProc()
 		}
 
 
-		if ( packets_read && needrefresh )
+		if (needrefresh)
 		{
 			needrefresh = false;
 			handleUpdate();
@@ -148,7 +152,13 @@ void NethogsMonitor::handleUpdate()
 			if (DEBUG)
 				std::cout << "PROC: Deleting process\n";
 
-			monitor_data.apps_info.erase(curproc->getVal()->name);
+			if( monitor_udpate_callback )
+			{
+				NethogsAppUpdate &data = monitor_update_data[curproc->getVal()->pid];
+				data.action = NethogsAppUpdate::Remove;
+				monitor_udpate_callback(data);
+				monitor_update_data.erase(curproc->getVal()->pid);
+			}
 
 			ProcList * todelete = curproc;
 			Process * p_todelete = curproc->getVal();
@@ -156,7 +166,8 @@ void NethogsMonitor::handleUpdate()
 			{
 				previousproc->next = curproc->next;
 				curproc = curproc->next;
-			} else {
+			} else 
+			{
 				processes = curproc->getNext();
 				curproc = processes;
 			}
@@ -166,37 +177,60 @@ void NethogsMonitor::handleUpdate()
 			//continue;
 		}
 		else
-		{			
-			NethogsMonitorData::Line& line =  monitor_data.apps_info[curproc->getVal()->name]; 
-			if( line.app_name.empty() )
-			{
-				line.app_name = curproc->getVal()->name;
-			}
-			if( line.device_name != curproc->getVal()->devicename )
-			{
-				line.device_name = curproc->getVal()->devicename;
-			}
-			line.pid = curproc->getVal()->pid;
-			line.uid = curproc->getVal()->getUid();
-				
-			getkbps  (curproc->getVal(), &line.sent_kbs,   &line.recv_kbs);
-			gettotal (curproc->getVal(), &line.recv_bytes, &line.sent_bytes);
+		{
+			int const pid = curproc->getVal()->pid;
+			u_int32_t sent_bytes;
+			u_int32_t recv_bytes;
+			float sent_kbs;
+			float recv_kbs;
+			getkbps  (curproc->getVal(), &sent_kbs,   &recv_kbs);
+			gettotal (curproc->getVal(), &recv_bytes, &sent_bytes);
 			
+			if( monitor_udpate_callback )
+			{
+				//notify update
+				NethogsAppUpdate &data = monitor_update_data[pid];
+				bool data_change = false;
+				
+				#define NHM_UPDATE_ONE_FIELD(TO,FROM) if((TO)!=(FROM)) { TO = FROM; data_change = true; }
+				NHM_UPDATE_ONE_FIELD( data.pid,         pid )
+				NHM_UPDATE_ONE_FIELD( data.uid,         curproc->getVal()->getUid() )
+				NHM_UPDATE_ONE_FIELD( data.app_name,    curproc->getVal()->name )
+				NHM_UPDATE_ONE_FIELD( data.device_name, curproc->getVal()->devicename )
+				NHM_UPDATE_ONE_FIELD( data.sent_bytes,  sent_bytes )
+				NHM_UPDATE_ONE_FIELD( data.recv_bytes,  recv_bytes )
+				NHM_UPDATE_ONE_FIELD( data.sent_kbs,    sent_kbs )
+				NHM_UPDATE_ONE_FIELD( data.recv_kbs,    recv_kbs )
+				#undef NHM_UPDATE_ONE_FIELD				
+				
+				if( data_change )
+				{
+					data.action = NethogsAppUpdate::Set;
+					monitor_udpate_callback(data);
+				}
+			}
+			
+			//next
 			previousproc = curproc;
 			curproc = curproc->next;
 		}
 	}
-	
-	monitor_udpate_callback(monitor_data);
 }
 
-void NethogsMonitor::start(NethogsMonitor::Callback const& cb)
+void NethogsMonitor::registerUpdateCallback(Callback const& cb)
+{
+	if( !monitor_thread_run_flag )
+	{
+		monitor_udpate_callback = cb;
+	}
+}
+
+void NethogsMonitor::start()
 {
 	bool expected = false;
 	if( monitor_thread_run_flag.compare_exchange_strong(expected, true) )
 	{
-		monitor_udpate_callback = cb;
-		monitor_thread_ptr = std::make_shared<std::thread>(&threadProc);
+		monitor_thread_ptr = std::make_shared<std::thread>(&NethogsMonitor::threadProc);
 	}
 }
 
diff --git a/libnethogs.h b/libnethogs.h
index cb92f1b..6e6f02d 100644
--- a/libnethogs.h
+++ b/libnethogs.h
@@ -1,38 +1,44 @@
 #ifndef NETHOGSMINITOR_H
 #define NETHOGSMINITOR_H
 
-#include <functional>
-#include <map>
+#include <string>
 
 #define NETHOGS_DSO_VISIBLE __attribute__ ((visibility ("default")))
 #define NETHOGS_DSO_HIDDEN  __attribute__ ((visibility ("hidden")))
 
-class NETHOGS_DSO_VISIBLE NethogsMonitorData
+class NETHOGS_DSO_VISIBLE NethogsAppUpdate
 {
-	public:
-	class Line
+public:
+	enum Action {Set, Remove};
+	NethogsAppUpdate() 
+	: action(Set), pid(0), uid(0), sent_kbs(0), recv_kbs(0)
 	{
-		public:
-		std::string app_name;
-		std::string device_name;
-		int			uid;
-		int 		pid;
-		u_int32_t	sent_bytes;
-		u_int32_t	recv_bytes;
-		float		sent_kbs;
-		float		recv_kbs;
-	};
-	typedef std::map<std::string, Line> TAppMap;
-	TAppMap apps_info;
+	}
+	Action		action;
+	int 		pid;
+	u_int32_t	uid;
+	std::string app_name;
+	std::string device_name;
+	u_int32_t	sent_bytes;
+	u_int32_t	recv_bytes;
+	float		sent_kbs;
+	float		recv_kbs;
 };
 
 class NETHOGS_DSO_VISIBLE NethogsMonitor
 {
 	NethogsMonitor();
 public:
-	typedef std::function<void(NethogsMonitorData const&)> Callback;
+	typedef void(*Callback)(NethogsAppUpdate const&);
 	
-	static void start(Callback const& cb);
+	//register async callback to receive updates
+	//have to be called before start
+	static void registerUpdateCallback(Callback const& cb);
+		
+	//start the monitor
+	static void start();
+	
+	//stop the monitor
 	static void stop();
 	
 private: