diff --git a/Vrh.Log4Pro.MaintenanceConsole/ConsoleFunction - ColorConsole.cs b/Vrh.Log4Pro.MaintenanceConsole/ConsoleFunction - ColorConsole.cs
index cd9f695..ac3db91 100644
--- a/Vrh.Log4Pro.MaintenanceConsole/ConsoleFunction - ColorConsole.cs
+++ b/Vrh.Log4Pro.MaintenanceConsole/ConsoleFunction - ColorConsole.cs
@@ -93,6 +93,40 @@ namespace Vrh.Log4Pro.MaintenanceConsole.ColorConsoleNS
 		}
 
 		/// <summary>
+		/// Törli az aktuális sort (szóközökkel) a pillanatnyi pozíciótól a megadott szélességben
+		/// </summary>
+		/// <param name="width">ha 0, akkor a sor végéig</param>
+		public static void ClearLine(int width=0,char fillchar=' ')
+		{
+			int currentLineCursor = Console.CursorTop;
+			int currentColCursor = Console.CursorLeft;
+			if (width == 0) { width = Console.WindowWidth - currentColCursor; }
+			Console.SetCursorPosition(currentColCursor, Console.CursorTop);
+			Console.Write(new string(fillchar, width));
+			Console.SetCursorPosition(currentColCursor, currentLineCursor);
+		}
+
+
+		/// <summary>
+		/// Törli (szóközökkel) a megadott szélességű és magasságú területet a megadott cursor pozíciótól véve
+		/// </summary>
+		/// <param name="height">ha 0, akkor az ablak aljáig</param>
+		/// <param name="width">ha 0, akkor a sorok végéig</param>
+		public static void ClearArea(int width=0, int height=0, char fillchar = ' ')
+		{
+			int currentLineCursor = Console.CursorTop;
+			int currentColCursor = Console.CursorLeft;
+			if (height == 0) { height = Console.WindowHeight; }
+			for (var i=0;i<height;i++) 
+			{
+				ClearLine(width, fillchar);
+				Console.CursorTop++;
+			}
+			Console.SetCursorPosition(currentColCursor, currentLineCursor);
+		}
+
+
+		/// <summary>
 		/// Beolvas egy sort a consolról, vagy commandmode-ban a bufferból
 		/// </summary>
 		/// <param name="text"></param>
diff --git a/Vrh.Log4Pro.MaintenanceConsole/ConsoleFunction - Tools - TcpIp.cs b/Vrh.Log4Pro.MaintenanceConsole/ConsoleFunction - Tools - TcpIp.cs
index 4830e59..cf0a2de 100644
--- a/Vrh.Log4Pro.MaintenanceConsole/ConsoleFunction - Tools - TcpIp.cs
+++ b/Vrh.Log4Pro.MaintenanceConsole/ConsoleFunction - Tools - TcpIp.cs
@@ -35,7 +35,7 @@ namespace Vrh.Log4Pro.MaintenanceConsole.ToolsNS
 		private Pinger(string hostNameOrAddress, PingerConfig pc)
 		{
 			this.HostNameOrAddress = hostNameOrAddress;
-			this.History = new PingHistory(hostNameOrAddress, pc.pingerhistorylength, pc.pingcyclefrequency);
+			this.History = new PingHistory(hostNameOrAddress, pc);
 			this.PingTimeout = pc.pingtimeout;
 			this.PingCycleFrequency = pc.pingcyclefrequency;
 			this.PingCycleNumberOfPackages = pc.pingcyclenumofpackages;
@@ -269,9 +269,10 @@ namespace Vrh.Log4Pro.MaintenanceConsole.ToolsNS
 					var _pingcyclenumofpackages = GetPositiveIntFromXml(PINGCYCLENUMOFPACKAGES, pingerconfig);
 					var _pingerlifetime = GetPositiveIntFromXml(PINGERACTIVELENGTHTOSTOPPERIOD, pingerconfig);
 					var _pingerhistorylength = GetPositiveIntFromXml(PINGERHISTORYLENGTH, pingerconfig);
+					var _optimizehistorylength = pingerconfig.Element(OPTIMIZEHISTORYLENGTH)?.Value; ;
 					var _roundtriptimelimits = pingerconfig.Element(ROUNDTRIPTIMELIMITS)?.Value;
 					var _roundtriptimecategorylimits = pingerconfig.Element(ROUNDTRIPTIMECATEGORYLIMITS)?.Value;
-					SetValues(_pingtimeout, _pingcyclefrequency, _pingcyclenumofpackages, _pingerlifetime, _pingerhistorylength, _roundtriptimelimits, _roundtriptimecategorylimits);
+					SetValues(_pingtimeout, _pingcyclefrequency, _pingcyclenumofpackages, _pingerlifetime, _pingerhistorylength, _roundtriptimelimits, _roundtriptimecategorylimits,_optimizehistorylength);
 				}
 				else { SetValues(); }
 			}
@@ -284,9 +285,9 @@ namespace Vrh.Log4Pro.MaintenanceConsole.ToolsNS
 			/// <param name="pingcyclenumofpackages">pcs</param>
 			/// <param name="pingeractivelength">minutes</param>
 			/// <param name="pingerhistorylength">minutes</param>
-			public PingerConfig(int pingtimeout = 0, int pingcyclefrequency = 0, int pingcyclenumofpackages = 0, int pingeractivelength = 0, int pingerhistorylength = 0,string rttlimits=null, string rttcatlimits=null)
+			public PingerConfig(int pingtimeout = 0, int pingcyclefrequency = 0, int pingcyclenumofpackages = 0, int pingeractivelength = 0, int pingerhistorylength = 0,string rttlimits=null, string rttcatlimits=null,string optimizehlength=null)
 			{
-				SetValues(pingtimeout, pingcyclefrequency, pingcyclenumofpackages, pingeractivelength, pingerhistorylength, rttlimits , rttcatlimits);
+				SetValues(pingtimeout, pingcyclefrequency, pingcyclenumofpackages, pingeractivelength, pingerhistorylength, rttlimits , rttcatlimits, optimizehlength);
 			}
 
 			/// <summary>
@@ -297,11 +298,14 @@ namespace Vrh.Log4Pro.MaintenanceConsole.ToolsNS
 			/// <param name="pingcyclenumofpackages">pcs</param>
 			/// <param name="pingeractivelength">minutes</param>
 			/// <param name="pingerhistorylength">minutes</param>
-			private void SetValues(int pingtimeout = 0, int pingcyclefrequency = 0, int pingcyclenumofpackages = 0, int pingeractivelength = 0, int pingerhistorylength = 0, string rttlimits = null, string rttcatlimits = null)
+			private void SetValues(int pingtimeout = 0, int pingcyclefrequency = 0, int pingcyclenumofpackages = 0, int pingeractivelength = 0, int pingerhistorylength = 0, string rttlimits = null, string rttcatlimits = null,string optimizehlength=null)
 			{
 				this.pingcyclenumofpackages = pingcyclenumofpackages <= 0 ? PingerConfig.DEFAULT_PINGCYCLENUMOFPACKAGES : pingcyclenumofpackages;
 				this.pingeractivlength = (pingeractivelength <= 0 ? PingerConfig.DEFAULT_PINGERACTIVELENGTH : pingeractivelength) * 60 * 1000;
 				this.pingerhistorylength = (pingerhistorylength <= 0 ? PingerConfig.DEFAULT_PINGERHISTORYLENGTH : pingerhistorylength) * 60 * 1000;
+				bool optimizehlengthbool=true;
+				if (optimizehlength != null) { optimizehlengthbool = bool.TryParse(optimizehlength.ToLower(), out optimizehlengthbool) ? optimizehlengthbool : true; }
+				this.optimizehistorylength = optimizehlengthbool;
 
 				try
 				{
@@ -354,12 +358,14 @@ namespace Vrh.Log4Pro.MaintenanceConsole.ToolsNS
 			public int pingcyclenumofpackages;
 			public int pingeractivlength;
 			public int pingerhistorylength;
+			public bool optimizehistorylength;
 
 			const string PINGTIMEOUT = "PingTimeout";
 			const string PINGCYCLEFREQUENCY = "PingCycleFrequency";
 			const string PINGCYCLENUMOFPACKAGES = "PingCycleNumOfPackages";
 			const string PINGERACTIVELENGTHTOSTOPPERIOD = "PingerActiveLength";
 			const string PINGERHISTORYLENGTH = "PingerHistoryLength";
+			const string OPTIMIZEHISTORYLENGTH = "OptimizeHistoryLength";
 			const string ROUNDTRIPTIMELIMITS = "RoundTripTimeLimits";
 			const string ROUNDTRIPTIMECATEGORYLIMITS = "RoundTripCategoryLimits";
 			public const int DEFAULT_PINGTIMEOUT = 0;
@@ -397,19 +403,25 @@ namespace Vrh.Log4Pro.MaintenanceConsole.ToolsNS
 			/// </summary>
 			public int PingCycleFrequency;
 
+			/// <summary>
+			/// Az érvényes configuráció
+			/// </summary>
+			public PingerConfig PingerConfig;
+
 			public string HostNameOrAddress;
 			public PingerStatus PingerState = PingerStatus.Still;
 			public DateTime StartTime;
 
 			private object historylocker = new object();
 
-			public PingHistory(string hostnameoraddress, int pingerhistorylength,int pingcyclefrequency)
+			public PingHistory(string hostnameoraddress, PingerConfig pingerconfig)
 			{
 				this.HostNameOrAddress = hostnameoraddress;
 				this.PingStateQueue = new List<PingCycle>();
 				this.LastPingCycle = null;
-				this.Length = pingerhistorylength;
-				this.PingCycleFrequency = pingcyclefrequency;
+				this.Length = pingerconfig.pingerhistorylength;
+				this.PingCycleFrequency = pingerconfig.pingcyclefrequency;
+				this.PingerConfig = pingerconfig;
 			}
 			public PingHistory(PingHistory ph) 
 			{
@@ -418,6 +430,7 @@ namespace Vrh.Log4Pro.MaintenanceConsole.ToolsNS
 				this.LastPingCycle = ph.LastPingCycle;
 				this.Length = ph.Length;
 				this.PingCycleFrequency = ph.PingCycleFrequency;
+				this.PingerConfig = ph.PingerConfig;
 			}
 
 			public void Dispose()
@@ -433,7 +446,7 @@ namespace Vrh.Log4Pro.MaintenanceConsole.ToolsNS
 			{
 				lock (historylocker)
 				{
-					if (this.LastPingCycle?.isDifferent(newpc) ?? true) { this.PingStateQueue.Add(newpc); this.LastPingCycle = newpc; }
+					if (!this.PingerConfig.optimizehistorylength || (this.LastPingCycle?.isDifferent(newpc) ?? true)) { this.PingStateQueue.Add(newpc); this.LastPingCycle = newpc; }
 					else
 					{
 						var totalrtt = ((this.LastPingCycle.RoundtripTimeAverage * this.LastPingCycle.NumberOfCycles) + newpc.RoundtripTimeAverage);
@@ -590,7 +603,8 @@ namespace Vrh.Log4Pro.MaintenanceConsole.ToolsNS
 			/// <returns></returns>
 			public bool isDifferent(PingCycle pc)
 			{
-				return this.StatusCategory != pc.StatusCategory || this.RoundtripTime != pc.RoundtripTime;
+				return this.StatusCategory != pc.StatusCategory 
+					|| this.RoundtripTime != pc.RoundtripTime;
 			}
 			#endregion isDifferent
 
diff --git a/Vrh.Log4Pro.MaintenanceConsole/Manager - MaintenanceToolManager.cs b/Vrh.Log4Pro.MaintenanceConsole/Manager - MaintenanceToolManager.cs
index 10491f7..03484e0 100644
--- a/Vrh.Log4Pro.MaintenanceConsole/Manager - MaintenanceToolManager.cs
+++ b/Vrh.Log4Pro.MaintenanceConsole/Manager - MaintenanceToolManager.cs
@@ -191,6 +191,7 @@ namespace Vrh.Log4Pro.MaintenanceConsole.MaintenanceToolManagerNS
 			ColorConsole.WriteLine((pconfig.pingcyclefrequency / 1000).ToString(), ConsoleColor.Yellow, prefix: "   cycle frequency:", suffix: "sec");
 			ColorConsole.WriteLine((pconfig.pingeractivlength / 60000).ToString(), ConsoleColor.Yellow, prefix: "   pinger liftime :", suffix: "min");
 			ColorConsole.WriteLine((pconfig.pingerhistorylength / 60000).ToString(), ConsoleColor.Yellow, prefix: "   history length :", suffix: "min");
+			ColorConsole.WriteLine((pconfig.optimizehistorylength).ToString(), ConsoleColor.Yellow, prefix: "   optimize history length :", suffix: "");
 			var rttlstring = (string.Join(",", pconfig.RoundTripTimeLimits)).ToString();
 			ColorConsole.WriteLine(rttlstring.Substring(0, rttlstring.Length>20?20: rttlstring.Length) + (rttlstring.Length > 20 ? "..." : ""), ConsoleColor.Yellow, prefix: "   roundtrip time limit values :", suffix: "ms");
 			ColorConsole.WriteLine((string.Join(",", pconfig.RoundTripTimeyCategoryLimits)).ToString(), ConsoleColor.Yellow, prefix: "   roundtrip time category limit values:", suffix: "ms");
@@ -198,13 +199,10 @@ namespace Vrh.Log4Pro.MaintenanceConsole.MaintenanceToolManagerNS
 		private static void DisplayPingerHistory(List<Pinger> selectedpingers,int firstrow,int cc)
 		{
 			if (selectedpingers == null || !selectedpingers.Any()) { return; }
-			var lastrow = ColorConsole.CursorTop;
-			ColorConsole.SetCursorPosition(cc,firstrow);
-			for (var i= 0;  i< lastrow - firstrow;i++) { ColorConsole.WriteLine(new string(' ',100)); }
 			ColorConsole.SetCursorPosition(cc, firstrow);
 
-			ColorConsole.WriteLine();
-			ColorConsole.WriteLine($"Pinger History:", ConsoleColor.Yellow);
+			ColorConsole.ClearLine();ColorConsole.WriteLine();
+			ColorConsole.ClearLine();ColorConsole.WriteLine($"Pinger History:", ConsoleColor.Yellow);
 			var cursorleftposition = ColorConsole.CursorLeft;
 			var cursortopposition = ColorConsole.CursorTop;
 			while (true)
@@ -215,8 +213,8 @@ namespace Vrh.Log4Pro.MaintenanceConsole.MaintenanceToolManagerNS
 				foreach (var pinger in selectedpingers) { pingcyclefrequency=DisplayOnePingerHistory(pinger); if (ColorConsole.KeyAvailable) { goto finishdisplayhistory; };}
 				var elapsed = DateTime.Now.Subtract(monitorcyclestart).TotalMilliseconds;
 				if (elapsed < pingcyclefrequency) { Thread.Sleep((int)((double)pingcyclefrequency - elapsed)); }
-				ColorConsole.WriteLine();
-				ColorConsole.WriteLine($"Press any key to exit from monitoring...", ConsoleColor.Yellow);
+				ColorConsole.ClearLine(); ColorConsole.WriteLine();
+				ColorConsole.ClearLine(); ColorConsole.WriteLine($"Press any key to exit from monitoring...", ConsoleColor.Yellow);
 			}
 		finishdisplayhistory:;
 		}
@@ -225,6 +223,7 @@ namespace Vrh.Log4Pro.MaintenanceConsole.MaintenanceToolManagerNS
 			var _h = pinger.GetHistory();
 			if (_h == null) { return 0; }
 			var h = new Pinger.PingHistory(_h);//klónozzuk, mert egyébként ha az adatgyűjtés miatt megváltozik akkor exception-re fut a foreach
+			ColorConsole.ClearLine();
 			ColorConsole.Write(pinger.HostNameOrAddress, ConsoleColor.Yellow, suffix: ":   ",prefix:"   ");
 			var pingerstatus = pinger.Operating ? "pinging" : "still";
 			var pingerstatuscolor = pinger.Operating ? ConsoleColor.Green : ConsoleColor.Yellow;
diff --git a/Vrh.Log4Pro.MaintenanceConsole/Properties/AssemblyInfo.cs b/Vrh.Log4Pro.MaintenanceConsole/Properties/AssemblyInfo.cs
index bd747b3..203ef90 100644
--- a/Vrh.Log4Pro.MaintenanceConsole/Properties/AssemblyInfo.cs
+++ b/Vrh.Log4Pro.MaintenanceConsole/Properties/AssemblyInfo.cs
@@ -32,5 +32,5 @@ using System.Runtime.InteropServices;
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.8.2.0")]
-[assembly: AssemblyFileVersion("1.8.2.0")]
+[assembly: AssemblyVersion("1.8.3.0")]
+[assembly: AssemblyFileVersion("1.8.3.0")]
--
libgit2 0.21.2