udpates some logging stuff which will also make logging faster.

src/Umbraco.Core/CoreBootManager.cs

@@ -66,7 +66,9 @@ namespace Umbraco.Core
 
 	        InitializeProfilerResolver();
 
-            _timer = DisposableTimer.TraceDuration<CoreBootManager>("Umbraco application starting on '" + NetworkHelper.MachineName + "'", "Umbraco application startup complete");
+	        _timer = DisposableTimer.TraceDuration<CoreBootManager>(
+	            string.Format("Umbraco {0} application starting on {1}", UmbracoVersion.Current, NetworkHelper.MachineName),
+	            "Umbraco application startup complete");
             
 	        CreateApplicationCache();
 

src/Umbraco.Core/Logging/LogHelper.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics;
 using System.Linq;
 using System.Threading;
 using System.Web;
@@ -40,8 +41,11 @@ namespace Umbraco.Core.Logging
 		/// <returns></returns>
 		private static string PrefixThreadId(string generateMessageFormat)
 		{
-            return "[T" + Thread.CurrentThread.ManagedThreadId + "/D" + AppDomain.CurrentDomain.Id + "] " + generateMessageFormat;
-        }
+		    return (_prefixThreadId ?? (_prefixThreadId = "[P" + Process.GetCurrentProcess().Id + "/T" + Thread.CurrentThread.ManagedThreadId + "/D" + AppDomain.CurrentDomain.Id + "] "))
+		           + generateMessageFormat;
+		}
+
+	    private static string _prefixThreadId = null;
 
 		#region Error
 		/// <summary>