diff --git a/Orm/Xtensive.Orm.Tests.Core/Diagnostics/LogMessageTest.cs b/Orm/Xtensive.Orm.Tests.Core/Diagnostics/LogMessageTest.cs
index 9e6520e15d..305de8f341 100644
--- a/Orm/Xtensive.Orm.Tests.Core/Diagnostics/LogMessageTest.cs
+++ b/Orm/Xtensive.Orm.Tests.Core/Diagnostics/LogMessageTest.cs
@@ -57,7 +57,7 @@ public void PerformanceTest()
       }
       catch (Exception e)
       {
-        TestLog.Warning(e, "Message for {0} log parameters.", param2);
+        TestLog.Warning(e, "Message for {0} log parameters.", [param2]);
       }
 
       TestLog.InfoRegion("Fatal error logs");
@@ -73,4 +73,4 @@ public void PerformanceTest()
 
     }
   }
-}
\ No newline at end of file
+}
diff --git a/Orm/Xtensive.Orm.Tests.Framework/Dynamic.cs b/Orm/Xtensive.Orm.Tests.Framework/Dynamic.cs
index 1b943fef94..8c080dd78b 100644
--- a/Orm/Xtensive.Orm.Tests.Framework/Dynamic.cs
+++ b/Orm/Xtensive.Orm.Tests.Framework/Dynamic.cs
@@ -2226,12 +2226,12 @@ private void ValidateToken(TokenId t)
       if (token.id != t) throw ParseError(Res.SyntaxError);
     }
 
-    private Exception ParseError(string format, params object[] args)
+    private Exception ParseError(string format, params ReadOnlySpan<object> args)
     {
       return ParseError(token.pos, format, args);
     }
 
-    private Exception ParseError(int pos, string format, params object[] args)
+    private Exception ParseError(int pos, string format, params ReadOnlySpan<object> args)
     {
       return new ParseException(string.Format(CultureInfo.CurrentCulture, format, args), pos);
     }
diff --git a/Orm/Xtensive.Orm/InternalLogs.cs b/Orm/Xtensive.Orm/InternalLogs.cs
index 11dc9ad250..5beb272310 100644
--- a/Orm/Xtensive.Orm/InternalLogs.cs
+++ b/Orm/Xtensive.Orm/InternalLogs.cs
@@ -18,16 +18,16 @@ public static bool IsLogged(LogLevel type)
       return instance.IsLogged(type);
     }
 
-    public static IndentManager.IndentScope DebugRegion(string messageId, params object[] args) =>
+    public static IndentManager.IndentScope DebugRegion(string messageId, params ReadOnlySpan<object> args) =>
       instance.DebugRegion(messageId, args);
 
-    public static IndentManager.IndentScope InfoRegion(string messageId, params object[] args) =>
+    public static IndentManager.IndentScope InfoRegion(string messageId, params ReadOnlySpan<object> args) =>
       instance.InfoRegion(messageId, args);
 
-    public static void Debug(string messageId, params object[] args) =>
+    public static void Debug(string messageId, params ReadOnlySpan<object> args) =>
       instance.Debug(messageId, args);
 
-    public static Exception Debug(Exception exception, string messageId, params object[] args)
+    public static Exception Debug(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Debug(messageId, args, exception);
       return exception;
@@ -39,10 +39,10 @@ public static Exception Debug(Exception exception)
       return exception;
     }
 
-    public static void Info(string messageId, params object[] args) =>
+    public static void Info(string messageId, params ReadOnlySpan<object> args) =>
       instance.Info(messageId, args);
 
-    public static Exception Info(Exception exception, string messageId, params object[] args)
+    public static Exception Info(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Info(messageId, args, exception);
       return exception;
@@ -54,10 +54,10 @@ public static Exception Info(Exception exception)
       return exception;
     }
 
-    public static void Warning(string messageId, params object[] args) =>
+    public static void Warning(string messageId, params ReadOnlySpan<object> args) =>
       instance.Warning(messageId, args);
 
-    public static Exception Warning(Exception exception, string messageId, params object[] args)
+    public static Exception Warning(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Warning(messageId, args, exception);
       return exception;
@@ -69,10 +69,10 @@ public static Exception Warning(Exception exception)
       return exception;
     }
 
-    public static void Error(string messageId, params object[] args) =>
+    public static void Error(string messageId, params ReadOnlySpan<object> args) =>
       instance.Error(messageId, args);
 
-    public static Exception Error(Exception exception, string messageId, params object[] args)
+    public static Exception Error(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Error(messageId, args, exception);
       return exception;
@@ -84,10 +84,10 @@ public static Exception Error(Exception exception)
       return exception;
     }
 
-    public static void FatalError(string messageId, params object[] args) =>
+    public static void FatalError(string messageId, params ReadOnlySpan<object> args) =>
       instance.FatalError(messageId, args);
 
-    public static Exception FatalError(Exception exception, string messageId, params object[] args)
+    public static Exception FatalError(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.FatalError(messageId, args, exception);
       return exception;
@@ -120,16 +120,16 @@ public static bool IsLogged(LogLevel type)
       return instance.IsLogged(type);
     }
 
-    public static IndentManager.IndentScope DebugRegion(string messageId, params object[] args) =>
+    public static IndentManager.IndentScope DebugRegion(string messageId, params ReadOnlySpan<object> args) =>
       instance.DebugRegion(messageId, args);
 
-    public static IndentManager.IndentScope InfoRegion(string messageId, params object[] args) =>
+    public static IndentManager.IndentScope InfoRegion(string messageId, params ReadOnlySpan<object> args) =>
       instance.InfoRegion(messageId, args);
 
-    public static void Debug(string messageId, params object[] args) =>
+    public static void Debug(string messageId, params ReadOnlySpan<object> args) =>
       instance.Debug(messageId, args);
 
-    public static Exception Debug(Exception exception, string messageId, params object[] args)
+    public static Exception Debug(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Debug(messageId, args, exception);
       return exception;
@@ -141,10 +141,10 @@ public static Exception Debug(Exception exception)
       return exception;
     }
 
-    public static void Info(string messageId, params object[] args) =>
+    public static void Info(string messageId, params ReadOnlySpan<object> args) =>
       instance.Info(messageId, args);
 
-    public static Exception Info(Exception exception, string messageId, params object[] args)
+    public static Exception Info(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Info(messageId, args, exception);
       return exception;
@@ -156,10 +156,10 @@ public static Exception Info(Exception exception)
       return exception;
     }
 
-    public static void Warning(string messageId, params object[] args) =>
+    public static void Warning(string messageId, params ReadOnlySpan<object> args) =>
       instance.Warning(messageId, args);
 
-    public static Exception Warning(Exception exception, string messageId, params object[] args)
+    public static Exception Warning(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Warning(messageId, args, exception);
       return exception;
@@ -171,12 +171,12 @@ public static Exception Warning(Exception exception)
       return exception;
     }
 
-    public static void Error(string format, params object[] args)
+    public static void Error(string format, params ReadOnlySpan<object> args)
     {
       instance.Error(format, args);
     }
 
-    public static Exception Error(Exception exception, string format, params object[] args)
+    public static Exception Error(Exception exception, string format, params ReadOnlySpan<object> args)
     {
       instance.Error(format, args, exception);
       return exception;
@@ -188,12 +188,12 @@ public static Exception Error(Exception exception)
       return exception;
     }
 
-    public static void FatalError(string format, params object[] args)
+    public static void FatalError(string format, params ReadOnlySpan<object> args)
     {
       instance.FatalError(format, args);
     }
 
-    public static Exception FatalError(Exception exception, string format, params object[] args)
+    public static Exception FatalError(Exception exception, string format, params ReadOnlySpan<object> args)
     {
       instance.FatalError(format, args, exception);
       return exception;
@@ -226,16 +226,16 @@ public static bool IsLogged(LogLevel type)
       return instance.IsLogged(type);
     }
 
-    public static IndentManager.IndentScope DebugRegion(string messageId, params object[] args) =>
+    public static IndentManager.IndentScope DebugRegion(string messageId, params ReadOnlySpan<object> args) =>
       instance.DebugRegion(messageId, args);
 
-    public static IndentManager.IndentScope InfoRegion(string messageId, params object[] args) =>
+    public static IndentManager.IndentScope InfoRegion(string messageId, params ReadOnlySpan<object> args) =>
       instance.InfoRegion(messageId, args);
 
-    public static void Debug(string messageId, params object[] args) =>
+    public static void Debug(string messageId, params ReadOnlySpan<object> args) =>
       instance.Debug(messageId, args);
 
-    public static Exception Debug(Exception exception, string format, params object[] args)
+    public static Exception Debug(Exception exception, string format, params ReadOnlySpan<object> args)
     {
       instance.Debug(format, args, exception);
       return exception;
@@ -247,10 +247,10 @@ public static Exception Debug(Exception exception)
       return exception;
     }
 
-    public static void Info(string messageId, params object[] args) =>
+    public static void Info(string messageId, params ReadOnlySpan<object> args) =>
       instance.Info(messageId, args);
 
-    public static Exception Info(Exception exception, string messageId, params object[] args)
+    public static Exception Info(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Info(messageId, args, exception);
       return exception;
@@ -262,10 +262,10 @@ public static Exception Info(Exception exception)
       return exception;
     }
 
-    public static void Warning(string messageId, params object[] args) =>
+    public static void Warning(string messageId, params ReadOnlySpan<object> args) =>
       instance.Warning(messageId, args);
 
-    public static Exception Warning(Exception exception, string messageId, params object[] args)
+    public static Exception Warning(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Warning(messageId, args, exception);
       return exception;
@@ -277,10 +277,10 @@ public static Exception Warning(Exception exception)
       return exception;
     }
 
-    public static void Error(string messageId, params object[] args) =>
+    public static void Error(string messageId, params ReadOnlySpan<object> args) =>
       instance.Error(messageId, args);
 
-    public static Exception Error(Exception exception, string messageId, params object[] args)
+    public static Exception Error(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Error(messageId, args, exception);
       return exception;
@@ -292,10 +292,10 @@ public static Exception Error(Exception exception)
       return exception;
     }
 
-    public static void FatalError(string messageId, params object[] args) =>
+    public static void FatalError(string messageId, params ReadOnlySpan<object> args) =>
       instance.FatalError(messageId, args);
 
-    public static Exception FatalError(Exception exception, string messageId, params object[] args)
+    public static Exception FatalError(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.FatalError(messageId, args, exception);
       return exception;
@@ -328,16 +328,16 @@ public static bool IsLogged(LogLevel type)
       return instance.IsLogged(type);
     }
 
-    public static IndentManager.IndentScope DebugRegion(string messageId, params object[] args) =>
+    public static IndentManager.IndentScope DebugRegion(string messageId, params ReadOnlySpan<object> args) =>
       instance.DebugRegion(messageId, args);
 
-    public static IndentManager.IndentScope InfoRegion(string messageId, params object[] args) =>
+    public static IndentManager.IndentScope InfoRegion(string messageId, params ReadOnlySpan<object> args) =>
       instance.InfoRegion(messageId, args);
 
-    public static void Debug(string messageId, params object[] args) =>
+    public static void Debug(string messageId, params ReadOnlySpan<object> args) =>
       instance.Debug(messageId, args);
 
-    public static Exception Debug(Exception exception, string messageId, params object[] args)
+    public static Exception Debug(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Debug(messageId, args, exception);
       return exception;
@@ -349,10 +349,10 @@ public static Exception Debug(Exception exception)
       return exception;
     }
 
-    public static void Info(string messageId, params object[] args) =>
+    public static void Info(string messageId, params ReadOnlySpan<object> args) =>
       instance.Info(messageId, args);
 
-    public static Exception Info(Exception exception, string messageId, params object[] args)
+    public static Exception Info(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Info(messageId, args, exception);
       return exception;
@@ -364,10 +364,10 @@ public static Exception Info(Exception exception)
       return exception;
     }
 
-    public static void Warning(string messageId, params object[] args) =>
+    public static void Warning(string messageId, params ReadOnlySpan<object> args) =>
       instance.Warning(messageId, args);
 
-    public static Exception Warning(Exception exception, string messageId, params object[] args)
+    public static Exception Warning(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Warning(messageId, args, exception);
       return exception;
@@ -379,10 +379,10 @@ public static Exception Warning(Exception exception)
       return exception;
     }
 
-    public static void Error(string messageId, params object[] args) =>
+    public static void Error(string messageId, params ReadOnlySpan<object> args) =>
       instance.Error(messageId, args);
 
-    public static Exception Error(Exception exception, string messageId, params object[] args)
+    public static Exception Error(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Error(messageId, args, exception);
       return exception;
@@ -394,10 +394,10 @@ public static Exception Error(Exception exception)
       return exception;
     }
 
-    public static void FatalError(string messageId, params object[] args) =>
+    public static void FatalError(string messageId, params ReadOnlySpan<object> args) =>
       instance.FatalError(messageId, args);
 
-    public static Exception FatalError(Exception exception, string messageId, params object[] args)
+    public static Exception FatalError(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.FatalError(messageId, args, exception);
       return exception;
@@ -430,16 +430,16 @@ public static bool IsLogged(LogLevel type)
       return instance.IsLogged(type);
     }
 
-    public static IndentManager.IndentScope DebugRegion(string messageId, params object[] args) =>
+    public static IndentManager.IndentScope DebugRegion(string messageId, params ReadOnlySpan<object> args) =>
       instance.DebugRegion(messageId, args);
 
-    public static IndentManager.IndentScope InfoRegion(string messageId, params object[] args) =>
+    public static IndentManager.IndentScope InfoRegion(string messageId, params ReadOnlySpan<object> args) =>
       instance.InfoRegion(messageId, args);
 
-    public static void Debug(string messageId, params object[] args) =>
+    public static void Debug(string messageId, params ReadOnlySpan<object> args) =>
       instance.Debug(messageId, args);
 
-    public static Exception Debug(Exception exception, string messageId, params object[] args)
+    public static Exception Debug(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Debug(messageId, args, exception);
       return exception;
@@ -451,10 +451,10 @@ public static Exception Debug(Exception exception)
       return exception;
     }
 
-    public static void Info(string messageId, params object[] args) =>
+    public static void Info(string messageId, params ReadOnlySpan<object> args) =>
       instance.Info(messageId, args);
 
-    public static Exception Info(Exception exception, string messageId, params object[] args)
+    public static Exception Info(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Info(messageId, args, exception);
       return exception;
@@ -466,10 +466,10 @@ public static Exception Info(Exception exception)
       return exception;
     }
 
-    public static void Warning(string messageId, params object[] args) =>
+    public static void Warning(string messageId, params ReadOnlySpan<object> args) =>
       instance.Warning(messageId, args);
 
-    public static Exception Warning(Exception exception, string messageId, params object[] args)
+    public static Exception Warning(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Warning(messageId, args, exception);
       return exception;
@@ -481,10 +481,10 @@ public static Exception Warning(Exception exception)
       return exception;
     }
 
-    public static void Error(string messageId, params object[] args) =>
+    public static void Error(string messageId, params ReadOnlySpan<object> args) =>
       instance.Error(messageId, args);
 
-    public static Exception Error(Exception exception, string messageId, params object[] args)
+    public static Exception Error(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Error(messageId, args, exception);
       return exception;
@@ -496,12 +496,12 @@ public static Exception Error(Exception exception)
       return exception;
     }
 
-    public static void FatalError(string format, params object[] args)
+    public static void FatalError(string format, params ReadOnlySpan<object> args)
     {
       instance.FatalError(format, args);
     }
 
-    public static Exception FatalError(Exception exception, string format, params object[] args)
+    public static Exception FatalError(Exception exception, string format, params ReadOnlySpan<object> args)
     {
       instance.FatalError(format, args, exception);
       return exception;
@@ -534,16 +534,16 @@ public static bool IsLogged(LogLevel type)
       return instance.IsLogged(type);
     }
 
-    public static IndentManager.IndentScope DebugRegion(string messageId, params object[] args) =>
+    public static IndentManager.IndentScope DebugRegion(string messageId, params ReadOnlySpan<object> args) =>
       instance.DebugRegion(messageId, args);
 
-    public static IndentManager.IndentScope InfoRegion(string messageId, params object[] args) =>
+    public static IndentManager.IndentScope InfoRegion(string messageId, params ReadOnlySpan<object> args) =>
       instance.InfoRegion(messageId, args);
 
-    public static void Debug(string messageId, params object[] args) =>
+    public static void Debug(string messageId, params ReadOnlySpan<object> args) =>
       instance.Debug(messageId, args);
 
-    public static Exception Debug(Exception exception, string messageId, params object[] args)
+    public static Exception Debug(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Debug(messageId, args, exception);
       return exception;
@@ -555,10 +555,10 @@ public static Exception Debug(Exception exception)
       return exception;
     }
 
-    public static void Info(string messageId, params object[] args) =>
+    public static void Info(string messageId, params ReadOnlySpan<object> args) =>
       instance.Info(messageId, args);
 
-    public static Exception Info(Exception exception, string messageId, params object[] args)
+    public static Exception Info(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Info(messageId, args, exception);
       return exception;
@@ -570,10 +570,10 @@ public static Exception Info(Exception exception)
       return exception;
     }
 
-    public static void Warning(string format, params object[] args) =>
+    public static void Warning(string format, params ReadOnlySpan<object> args) =>
       instance.Warning(format, args);
 
-    public static Exception Warning(Exception exception, string format, params object[] args)
+    public static Exception Warning(Exception exception, string format, params ReadOnlySpan<object> args)
     {
       instance.Warning(format, args, exception);
       return exception;
@@ -585,10 +585,10 @@ public static Exception Warning(Exception exception)
       return exception;
     }
 
-    public static void Error(string messageId, params object[] args) =>
+    public static void Error(string messageId, params ReadOnlySpan<object> args) =>
       instance.Error(messageId, args);
 
-    public static Exception Error(Exception exception, string messageId, params object[] args)
+    public static Exception Error(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.Error(messageId, args, exception);
       return exception;
@@ -600,10 +600,10 @@ public static Exception Error(Exception exception)
       return exception;
     }
 
-    public static void FatalError(string messageId, params object[] args) =>
+    public static void FatalError(string messageId, params ReadOnlySpan<object> args) =>
       instance.FatalError(messageId, args);
 
-    public static Exception FatalError(Exception exception, string messageId, params object[] args)
+    public static Exception FatalError(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.FatalError(messageId, args, exception);
       return exception;
diff --git a/Orm/Xtensive.Orm/InternalLogs.tt b/Orm/Xtensive.Orm/InternalLogs.tt
index c178c0bd59..c2ef1ffddf 100644
--- a/Orm/Xtensive.Orm/InternalLogs.tt
+++ b/Orm/Xtensive.Orm/InternalLogs.tt
@@ -20,23 +20,23 @@ namespace Xtensive
       return instance.IsLogged(type);
     }
 
-    public static IndentManager.IndentScope DebugRegion(string messageId, params object[] args)
+    public static IndentManager.IndentScope DebugRegion(string messageId, params ReadOnlySpan<object> args)
     {
       return instance.DebugRegion(format, args);
     }
 
-    public static IndentManager.IndentScope InfoRegion(string messageId, params object[] args)
+    public static IndentManager.IndentScope InfoRegion(string messageId, params ReadOnlySpan<object> args)
     {
       return instance.InfoRegion(format, args);
     }
 
 <# foreach (var level in logLevels) { #>
-    public static void <#= level #>(string messageId, params object[] args)
+    public static void <#= level #>(string messageId, params ReadOnlySpan<object> args)
     {
       instance.<#= level #>(format, args);
     }
 
-    public static Exception <#= level #>(Exception exception, string messageId, params object[] args)
+    public static Exception <#= level #>(Exception exception, string messageId, params ReadOnlySpan<object> args)
     {
       instance.<#= level #>(format, args, exception);
       return exception;
@@ -68,4 +68,4 @@ namespace Xtensive
    new Tuple<string, string>("SqlLog", "Xtensive.Orm.Sql"),
    new Tuple<string, string>("CoreLog", "Xtensive.Orm.Core"),
    new Tuple<string, string>("TestLog", "Xtensive.Orm.Tests")};
- #>
\ No newline at end of file
+ #>
diff --git a/Orm/Xtensive.Orm/Orm/Logging/BaseLog.cs b/Orm/Xtensive.Orm/Orm/Logging/BaseLog.cs
index 357943d874..b21176c6e3 100644
--- a/Orm/Xtensive.Orm/Orm/Logging/BaseLog.cs
+++ b/Orm/Xtensive.Orm/Orm/Logging/BaseLog.cs
@@ -35,16 +35,15 @@ public abstract class BaseLog
     /// </param>
     /// <param name="parameters">Values of parameters in <paramref name="messageId"/> (resource string or message itself).</param>
     /// <returns><see cref="IDisposable"/> object. Region will closed by disposing of this object.</returns>
-    public IndentManager.IndentScope DebugRegion(string messageId, params object[] parameters)
+    public IndentManager.IndentScope DebugRegion(string messageId, params ReadOnlySpan<object> parameters)
     {
       ArgumentNullException.ThrowIfNull(messageId, "message");
       if (!IsLogged(LogLevel.Debug))
         return IndentManager.IncreaseIndent();
       var message = Strings.ResourceManager.GetString(messageId, Strings.Culture) ?? messageId;
-      var title = parameters!=null ? string.Format(message, parameters) : message;
-      var titleParams = new object[] { title };
-      Debug(nameof(Strings.LogRegionBegin), titleParams);
-      return IndentManager.IncreaseIndent(() => Debug(nameof(Strings.LogRegionEnd), titleParams));
+      var title = parameters.Length > 0 ? string.Format(message, parameters) : message;
+      Debug(nameof(Strings.LogRegionBegin), [title]);
+      return IndentManager.IncreaseIndent(() => Debug(nameof(Strings.LogRegionEnd), [title]));
     }
 
     /// <summary>
@@ -58,13 +57,13 @@ public IndentManager.IndentScope DebugRegion(string messageId, params object[] p
     /// Values of parameters in <paramref name="messageId"/> (resource string or message itself).
     /// </param>
     /// <returns><see cref="IDisposable"/> object. Region will closed by disposing of this object.</returns>
-    public IndentManager.IndentScope InfoRegion(string messageId, params object[] parameters)
+    public IndentManager.IndentScope InfoRegion(string messageId, params ReadOnlySpan<object> parameters)
     {
       ArgumentNullException.ThrowIfNull(messageId, "message");
       if (!IsLogged(LogLevel.Info))
         return IndentManager.IncreaseIndent();
       var message = Strings.ResourceManager.GetString(messageId, Strings.Culture) ?? messageId;
-      var title = parameters!=null ? string.Format(message, parameters) : message;
+      var title = parameters.Length > 0 ? string.Format(message, parameters) : message;
       Info(string.Format(Strings.LogRegionBegin, title));
       return IndentManager.IncreaseIndent(() => Info(string.Format(Strings.LogRegionEnd, title)));
     }
@@ -79,7 +78,7 @@ public IndentManager.IndentScope InfoRegion(string messageId, params object[] pa
     /// Values of parameters in <paramref name="messageId"/> (resource string or message itself).
     /// </param>
     /// <param name="exception">Exception, which must be written.</param>
-    public virtual void Debug(string messageId, object[] parameters = null, Exception exception = null) =>
+    public virtual void Debug(string messageId, ReadOnlySpan<object> parameters = default, Exception exception = null) =>
       Write(LogLevel.Debug, messageId, parameters, exception);
 
     /// <summary>
@@ -91,7 +90,7 @@ public virtual void Debug(string messageId, object[] parameters = null, Exceptio
     /// Values of parameters in <paramref name="messageId"/> (resource string or message itself).
     /// </param>
     /// <param name="exception">Exception, which must be written.</param>
-    public virtual void Info(string messageId, object[] parameters = null, Exception exception = null) =>
+    public virtual void Info(string messageId, ReadOnlySpan<object> parameters = default, Exception exception = null) =>
       Write(LogLevel.Info, messageId, parameters, exception);
 
     /// <summary>
@@ -104,7 +103,7 @@ public virtual void Info(string messageId, object[] parameters = null, Exception
     /// Values of parameters in <paramref name="messageId"/> (resource string or message itself).
     /// </param>
     /// <param name="exception">Exception, which must be written.</param>
-    public virtual void Warning(string messageId, object[] parameters = null, Exception exception = null) =>
+    public virtual void Warning(string messageId, ReadOnlySpan<object> parameters = default, Exception exception = null) =>
       Write(LogLevel.Warning, messageId, parameters, exception);
 
     /// <summary>
@@ -117,7 +116,7 @@ public virtual void Warning(string messageId, object[] parameters = null, Except
     /// Values of parameters in <paramref name="messageId"/> (resource string or message itself).
     /// </param>
     /// <param name="exception">Exception, which must be written.</param>
-    public virtual void Error(string messageId, object[] parameters = null, Exception exception = null) =>
+    public virtual void Error(string messageId, ReadOnlySpan<object> parameters = default, Exception exception = null) =>
       Write(LogLevel.Error, messageId, parameters, exception);
 
     /// <summary>
@@ -130,10 +129,10 @@ public virtual void Error(string messageId, object[] parameters = null, Exceptio
     /// Values of parameters in <paramref name="messageId"/> (resource string or message itself).
     /// </param>
     /// <param name="exception">Exception, which must be written.</param>
-    public virtual void FatalError(string messageId, object[] parameters = null, Exception exception = null) =>
+    public virtual void FatalError(string messageId, ReadOnlySpan<object> parameters = default, Exception exception = null) =>
       Write(LogLevel.FatalError, messageId, parameters, exception);
 
-    private void Write(LogLevel logLevel, string messageId, object[] parameters, Exception exception)
+    private void Write(LogLevel logLevel, string messageId, ReadOnlySpan<object> parameters, Exception exception)
     {
       var message = string.IsNullOrEmpty(messageId)
         ? null
diff --git a/Orm/Xtensive.Orm/Orm/Logging/Internals/NullLog.cs b/Orm/Xtensive.Orm/Orm/Logging/Internals/NullLog.cs
index 66b3fdaeb9..a95358f7a4 100644
--- a/Orm/Xtensive.Orm/Orm/Logging/Internals/NullLog.cs
+++ b/Orm/Xtensive.Orm/Orm/Logging/Internals/NullLog.cs
@@ -15,23 +15,23 @@ public override bool IsLogged(LogLevel eventTypes)
       return false;
     }
 
-    public override void Debug(string message, object[] parameters = null, Exception exception = null)
+    public override void Debug(string message, ReadOnlySpan<object> parameters = default, Exception exception = null)
     {
     }
 
-    public override void Info(string message, object[] parameters = null, Exception exception = null)
+    public override void Info(string message, ReadOnlySpan<object> parameters = default, Exception exception = null)
     {
     }
 
-    public override void Warning(string message, object[] parameters = null, Exception exception = null)
+    public override void Warning(string message, ReadOnlySpan<object> parameters = default, Exception exception = null)
     {
     }
 
-    public override void Error(string message, object[] parameters = null, Exception exception = null)
+    public override void Error(string message, ReadOnlySpan<object> parameters = default, Exception exception = null)
     {
     }
 
-    public override void FatalError(string message, object[] parameters = null, Exception exception = null)
+    public override void FatalError(string message, ReadOnlySpan<object> parameters = default, Exception exception = null)
     {
     }
 
@@ -44,4 +44,4 @@ public NullLog(string name)
     {
     }
   }
-}
\ No newline at end of file
+}
diff --git a/Orm/Xtensive.Orm/Orm/Logging/LogEventInfo.cs b/Orm/Xtensive.Orm/Orm/Logging/LogEventInfo.cs
index e8346e9cfd..5bdea7ae10 100644
--- a/Orm/Xtensive.Orm/Orm/Logging/LogEventInfo.cs
+++ b/Orm/Xtensive.Orm/Orm/Logging/LogEventInfo.cs
@@ -52,11 +52,11 @@ public override string ToString()
       return builder.ToString();
     }
 
-    private static string FormatMessage(string message, object[] parameters)
+    private static string FormatMessage(string message, ReadOnlySpan<object> parameters)
     {
       if (string.IsNullOrEmpty(message))
         return null;
-      if (parameters==null || parameters.Length==0) {
+      if (parameters.Length == 0) {
         return message;
       }
       try {
@@ -83,7 +83,7 @@ private static string AppendIndent(string message)
     /// <param name="message">Log message.</param>
     /// <param name="parameters">Format parameters for log message.</param>
     /// <param name="exception">Exception.</param>
-    public LogEventInfo(string source, LogLevel level, string message = null, object[] parameters = null, Exception exception = null)
+    public LogEventInfo(string source, LogLevel level, string message = null, ReadOnlySpan<object> parameters = default, Exception exception = null)
     {
       Source = source;
       Level = level;
diff --git a/Orm/Xtensive.Orm/Orm/Model/TypeIndexInfoCollection.cs b/Orm/Xtensive.Orm/Orm/Model/TypeIndexInfoCollection.cs
index f53b31dc44..d06e23447e 100644
--- a/Orm/Xtensive.Orm/Orm/Model/TypeIndexInfoCollection.cs
+++ b/Orm/Xtensive.Orm/Orm/Model/TypeIndexInfoCollection.cs
@@ -48,14 +48,15 @@ public IndexInfo FindFirst(IndexAttributes indexAttributes) =>
       Find(indexAttributes).FirstOrDefault();
 
     [DebuggerStepThrough]
-    public IndexInfo GetIndex(string fieldName, params string[] fieldNames)
+    public IndexInfo GetIndex(string fieldName, params ReadOnlySpan<string> fieldNames)
     {
-      var names = (fieldNames ?? Array.Empty<string>()).Prepend(fieldName);
-
       var fields = new List<FieldInfo>();
       var reflectedTypeFields = primaryIndex.ReflectedType.Fields;
-      foreach (var name in names) {
-        if (reflectedTypeFields.TryGetValue(name, out var field)) {
+      if (reflectedTypeFields.TryGetValue(fieldName, out var field)) {
+        fields.Add(field);
+      }
+      foreach (var name in fieldNames) {
+        if (reflectedTypeFields.TryGetValue(name, out field)) {
           fields.Add(field);
         }
       }
diff --git a/Orm/Xtensive.Orm/Orm/QueryEndpoint.cs b/Orm/Xtensive.Orm/Orm/QueryEndpoint.cs
index 30135d6181..b647d9d401 100644
--- a/Orm/Xtensive.Orm/Orm/QueryEndpoint.cs
+++ b/Orm/Xtensive.Orm/Orm/QueryEndpoint.cs
@@ -954,12 +954,10 @@ public IQueryable<TElement> Items<TElement>(Expression<Func<EntitySet<TElement>>
     #region Private / internal methods
 
     /// <exception cref="ArgumentException"><paramref name="keyValues"/> array is empty.</exception>
-    private Key GetKeyByValues<T>(object[] keyValues)
+    private Key GetKeyByValues<T>(ReadOnlySpan<object> keyValues)
       where T : class, IEntity
     {
-      ArgumentNullException.ThrowIfNull(keyValues);
-      if (keyValues.Length == 0)
-        throw new ArgumentException(Strings.ExKeyValuesArrayIsEmpty, "keyValues");
+      ArgumentOutOfRangeException.ThrowIfZero(keyValues.Length);
       if (keyValues.Length == 1) {
         switch (keyValues[0]) {
           case Key key:
@@ -969,7 +967,7 @@ private Key GetKeyByValues<T>(object[] keyValues)
         }
       }
       var session = Session;
-      return Key.Create(session.Domain, session.StorageNodeId, typeof(T), TypeReferenceAccuracy.BaseType, keyValues);
+      return Key.Create(session.Domain, session.StorageNodeId, session.Domain.Model.Types[typeof(T)], TypeReferenceAccuracy.BaseType, keyValues);
     }
 
     private Expression BuildRootExpression(Type elementType)
diff --git a/Orm/Xtensive.Orm/Orm/Upgrade/Internals/HintGenerator.cs b/Orm/Xtensive.Orm/Orm/Upgrade/Internals/HintGenerator.cs
index f71f2c8640..8baab73b44 100644
--- a/Orm/Xtensive.Orm/Orm/Upgrade/Internals/HintGenerator.cs
+++ b/Orm/Xtensive.Orm/Orm/Upgrade/Internals/HintGenerator.cs
@@ -949,7 +949,7 @@ private static (string, string)[] AssociateMappedKeyFields(
         : null;
     }
 
-    private static (string, string)[] AssociateMappedFields(params (StoredFieldInfo, StoredFieldInfo)[] fieldsToProcess)
+    private static (string, string)[] AssociateMappedFields(params ReadOnlySpan<(StoredFieldInfo, StoredFieldInfo)> fieldsToProcess)
     {
       var result = new ChainedBuffer<(StoredFieldInfo, StoredFieldInfo)>();
       var tasks = new Queue<(StoredFieldInfo, StoredFieldInfo)>();
diff --git a/Orm/Xtensive.Orm/Sql/Model/Constraints/PrimaryKey.cs b/Orm/Xtensive.Orm/Sql/Model/Constraints/PrimaryKey.cs
index 9ca9d85ef9..25118f52e1 100644
--- a/Orm/Xtensive.Orm/Sql/Model/Constraints/PrimaryKey.cs
+++ b/Orm/Xtensive.Orm/Sql/Model/Constraints/PrimaryKey.cs
@@ -13,9 +13,9 @@ namespace Xtensive.Sql.Model
   public class PrimaryKey
     : UniqueConstraint
   {
-    internal PrimaryKey(Table table, string name, params TableColumn[] columns)
+    internal PrimaryKey(Table table, string name, params ReadOnlySpan<TableColumn> columns)
       : base(table, name, columns)
     {
     }
   }
-}
\ No newline at end of file
+}
diff --git a/Orm/Xtensive.Orm/Sql/Model/Constraints/UniqueConstraint.cs b/Orm/Xtensive.Orm/Sql/Model/Constraints/UniqueConstraint.cs
index bbaabde174..df7f04ac18 100644
--- a/Orm/Xtensive.Orm/Sql/Model/Constraints/UniqueConstraint.cs
+++ b/Orm/Xtensive.Orm/Sql/Model/Constraints/UniqueConstraint.cs
@@ -47,7 +47,7 @@ public override void Lock(bool recursive)
 
     #region Constructors
 
-    internal UniqueConstraint(Table table, string name, params TableColumn[] columns) : base(table, name, null, null, null)
+    internal UniqueConstraint(Table table, string name, params ReadOnlySpan<TableColumn> columns) : base(table, name, null, null, null)
     {
       this.columns = new NodeCollection<TableColumn>(columns.Length);
       for (int i = 0, count = columns.Length; i<count; i++)
@@ -56,4 +56,4 @@ internal UniqueConstraint(Table table, string name, params TableColumn[] columns
 
     #endregion
   }
-}
\ No newline at end of file
+}
diff --git a/Orm/Xtensive.Orm/Sql/Model/Table.cs b/Orm/Xtensive.Orm/Sql/Model/Table.cs
index dd332f395c..4e016b88ab 100644
--- a/Orm/Xtensive.Orm/Sql/Model/Table.cs
+++ b/Orm/Xtensive.Orm/Sql/Model/Table.cs
@@ -66,7 +66,7 @@ public DefaultConstraint CreateDefaultConstraint(string name, TableColumn column
     /// </summary>
     /// <param name="name">The name.</param>
     /// <param name="columns">The columns.</param>
-    public PrimaryKey CreatePrimaryKey(string name, params TableColumn[] columns)
+    public PrimaryKey CreatePrimaryKey(string name, params ReadOnlySpan<TableColumn> columns)
     {
       return new PrimaryKey(this, name, columns);
     }
@@ -76,7 +76,7 @@ public PrimaryKey CreatePrimaryKey(string name, params TableColumn[] columns)
     /// </summary>
     /// <param name="name">The name.</param>
     /// <param name="columns">The columns.</param>
-    public UniqueConstraint CreateUniqueConstraint(string name, params TableColumn[] columns)
+    public UniqueConstraint CreateUniqueConstraint(string name, params ReadOnlySpan<TableColumn> columns)
     {
       return new UniqueConstraint(this, name, columns);
     }