diff --git a/DTLib.Logging/Loggers/FileLogger.cs b/DTLib.Logging/Loggers/FileLogger.cs
index 08eaae8..7114e21 100644
--- a/DTLib.Logging/Loggers/FileLogger.cs
+++ b/DTLib.Logging/Loggers/FileLogger.cs
@@ -41,8 +41,7 @@ public class FileLogger : ILogger
         var msg = format.CreateMessage(context, severity, message);
         lock (LogfileStream)
         {
-            LogfileStream.Write(msg.ToBytes(StringConverter.UTF8));
-            LogfileStream.Flush();
+            LogfileStream.FluentWrite(msg.ToBytes(StringConverter.UTF8)).Flush();
         }
     }
 
diff --git a/DTLib.Network/FSP.cs b/DTLib.Network/FSP.cs
index b424b00..de3ba9d 100644
--- a/DTLib.Network/FSP.cs
+++ b/DTLib.Network/FSP.cs
@@ -69,7 +69,7 @@ public class FSP
             MainSocket.SendPackage("ready".ToBytes(StringConverter.UTF8));
             int packagesCount = 0;
             byte[] buffer = new byte[5120];
-            int fullPackagesCount = (Filesize / buffer.Length).Truncate();
+            int fullPackagesCount = (int)(Filesize / buffer.Length);
             // получение полных пакетов файла
             for (byte n = 0; packagesCount < fullPackagesCount; packagesCount++)
             {
@@ -113,7 +113,7 @@ public class FSP
             MainSocket.GetAnswer("ready");
             byte[] buffer = new byte[5120];
             int packagesCount = 0;
-            int fullPackagesCount = (Filesize / buffer.Length).Truncate();
+            int fullPackagesCount = (int)(Filesize / buffer.Length);
             // отправка полных пакетов файла
             for (; packagesCount < fullPackagesCount; packagesCount++)
             {
diff --git a/DTLib/Extensions/BaseConverter.cs b/DTLib/Extensions/BaseConverter.cs
index 418f86d..b9f7ee1 100644
--- a/DTLib/Extensions/BaseConverter.cs
+++ b/DTLib/Extensions/BaseConverter.cs
@@ -8,29 +8,46 @@ global using DTLib.Extensions;
 global using DTLib.Filesystem;
 global using static DTLib.Logging.PublicLog;
 using System.Globalization;
+using System.Runtime.CompilerServices;
 
 namespace DTLib.Extensions;
 
 public static class BaseConverter
 {
     // сокращение конвертации
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static bool ToBool<T>(this T input) => Convert.ToBoolean(input);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static char ToChar<T>(this T input) => Convert.ToChar(input);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static byte ToByte<T>(this T input) => Convert.ToByte(input);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static sbyte ToSByte<T>(this T input) => Convert.ToSByte(input);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static short ToShort<T>(this T input) => Convert.ToInt16(input);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static ushort ToUShort<T>(this T input) => Convert.ToUInt16(input);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static int ToInt<T>(this T input) => Convert.ToInt32(input);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static uint ToUInt<T>(this T input) => Convert.ToUInt32(input);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static long ToLong<T>(this T input) => Convert.ToInt64(input);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static ulong ToULong<T>(this T input) => Convert.ToUInt64(input);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static float ToFloat(this string input) => float.Parse(input, NumberStyles.Any, CultureInfo.InvariantCulture);
 #if NETSTANDARD2_1 || NET6_0 || NET7_0 || NET8_0
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static float ToFloat(this ReadOnlySpan<char> input) => float.Parse(input, NumberStyles.Any, CultureInfo.InvariantCulture);
 #endif
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static double ToDouble<T>(this T input) => Convert.ToDouble(input, CultureInfo.InvariantCulture);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static decimal ToDecimal<T>(this T input) => Convert.ToDecimal(input, CultureInfo.InvariantCulture);
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static int ToInt(this byte[] bytes)
     {
         int output = 0;
@@ -39,19 +56,25 @@ public static class BaseConverter
         return output;
     }
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static byte[] IntToBytes(this int num)
     {
         List<byte> output = new();
         while (num != 0)
         {
-            output.Add(ToByte(num % 256));
-            num = (num / 256).Truncate();
+            output.Add((byte)(num % 256));
+            num = (int)(num / 256.0);
         }
         output.Reverse();
         return output.ToArray();
     }
 
-    // Math.Truncate принимает как decimal, так и doublе,
-    // из-за чего вызов метода так: Math.Truncate(10/3) выдаст ошибку "неоднозначный вызов"
-    public static int Truncate<T>(this T number) => Math.Truncate(number.ToDouble()).ToInt();
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static int TruncateToInt(this double number) => Math.Truncate(number).ToInt();
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static int TruncateToInt(this decimal number) => Math.Truncate(number).ToInt();
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static long TruncateToLong(this double number) => Math.Truncate(number).ToLong();
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static long TruncateToLong(this decimal number) => Math.Truncate(number).ToLong();
 }
diff --git a/DTLib/Extensions/FluentStreamExtensions.cs b/DTLib/Extensions/FluentStreamExtensions.cs
new file mode 100644
index 0000000..e2af78f
--- /dev/null
+++ b/DTLib/Extensions/FluentStreamExtensions.cs
@@ -0,0 +1,165 @@
+using System.IO;
+using System.Runtime.CompilerServices;
+using System.Threading;
+
+namespace DTLib.Extensions;
+
+public static class FluentStreamExtensions
+{
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static void Write(this Stream s, byte[] buff) 
+        => s.Write(buff, 0, buff.Length);
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Stream FluentWriteByte(this Stream s, byte b)
+    {
+        s.WriteByte(b);
+        return s;
+    }
+    
+#region FluentWrite
+/*************************************
+            FluentWrite
+*************************************/
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Stream FluentWrite(this Stream s, byte[] buff)
+    {
+        s.Write(buff);
+        return s;
+    }
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Task<Stream> FluentWriteAsync(this Stream st, byte[] buff)
+        => FluentWriteAsync(st, buff, CancellationToken.None);
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static async Task<Stream> FluentWriteAsync(this Stream s, byte[] buff, CancellationToken ct)
+    {
+        await s.WriteAsync(buff, 0, buff.Length, ct);
+        return s;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Task<Stream> FluentWriteAsync(this Task<Stream> st, byte[] buff)
+        => FluentWriteAsync(st, buff, CancellationToken.None);
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static async Task<Stream> FluentWriteAsync(this Task<Stream> st, byte[] buff, CancellationToken ct)
+    {
+        Stream s = await st;
+        await s.WriteAsync(buff, 0, buff.Length, ct);
+        return s;
+    }
+    
+#endregion
+    
+#region FluentCopy
+/*************************************
+            FluentCopy
+*************************************/
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Stream FluentCopyTo(this Stream src, Stream dest)
+    {
+        src.CopyTo(dest);
+        return src;
+    }
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Task<Stream> FluentCopyToAsync(this Stream src, Stream dest)
+        => FluentCopyToAsync(src, dest, 81920, CancellationToken.None);
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Task<Stream> FluentCopyToAsync(this Stream src, Stream dest, int bufferSize)
+        => FluentCopyToAsync(src, dest, bufferSize, CancellationToken.None);
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static async Task<Stream> FluentCopyToAsync(this Stream src, Stream dest, int bufferSize, CancellationToken ct)
+    {
+        await src.CopyToAsync(dest, bufferSize, ct);
+        return src;
+    }
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Task<Stream> FluentCopyToAsync(this Task<Stream> src, Stream dest)
+        => FluentCopyToAsync(src, dest, 81920, CancellationToken.None);
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Task<Stream> FluentCopyToAsync(this Task<Stream> src, Stream dest, int bufferSize)
+        => FluentCopyToAsync(src, dest, bufferSize, CancellationToken.None);
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static async Task<Stream> FluentCopyToAsync(this Task<Stream> srcTask, Stream dest, int bufferSize, CancellationToken ct)
+    {
+        Stream src = await srcTask;
+        await src.CopyToAsync(dest, bufferSize, ct);
+        return src;
+    }
+    
+#endregion
+    
+#region FluentFlush
+/*************************************
+            FluentFlush
+*************************************/
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Stream FluentFlush(this Stream s)
+    {
+        s.Flush();
+        return s;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Task<Stream> FluentFlushAsync(this Stream s)
+        => FluentFlushAsync(s, CancellationToken.None);
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static async Task<Stream> FluentFlushAsync(this Stream s, CancellationToken ct)
+    {
+        await s.FlushAsync(ct);
+        return s;
+    }
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Task<Stream> FluentFlushAsync(this Task<Stream> st)
+        => FluentFlushAsync(st, CancellationToken.None);
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static async Task<Stream> FluentFlushAsync(this Task<Stream> st, CancellationToken ct)
+    {
+        Stream s = await st;
+        await s.FlushAsync(ct);
+        return s;
+    }
+    
+#endregion
+
+#region WriteString
+
+/*************************************
+            WriteString
+*************************************/
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static void WriteString(this Stream stream, string s) => 
+        stream.Write(s.ToBytes());
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static void WriteString(this Stream stream, string s, Encoding enc) =>
+        stream.Write(s.ToBytes(enc));
+    
+#endregion
+    
+#region FluentWriteString
+
+/*************************************
+            FluentWriteString
+*************************************/
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Stream FluentWriteString(this Stream stream, string s) => 
+        stream.FluentWrite(s.ToBytes());
+    
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Stream FluentWriteString(this Stream stream, string s, Encoding enc) =>
+        stream.FluentWrite(s.ToBytes(enc));
+    
+#endregion
+}
\ No newline at end of file
diff --git a/DTLib/Extensions/StreamExtensions.cs b/DTLib/Extensions/StreamExtensions.cs
deleted file mode 100644
index 06130fc..0000000
--- a/DTLib/Extensions/StreamExtensions.cs
+++ /dev/null
@@ -1,9 +0,0 @@
-using System.IO;
-
-namespace DTLib.Extensions;
-
-public static class StreamExtensions
-{
-    public static void Write(this Stream stream, byte[] buff)
-        => stream.Write(buff, 0, buff.Length);
-}
\ No newline at end of file
diff --git a/DTLib/Extensions/StringConverter.cs b/DTLib/Extensions/StringConverter.cs
index 40f5db0..898d437 100644
--- a/DTLib/Extensions/StringConverter.cs
+++ b/DTLib/Extensions/StringConverter.cs
@@ -4,7 +4,9 @@ public static class StringConverter
 {
     public static Encoding UTF8 = new UTF8Encoding(false);
     public static Encoding UTF8BOM = new UTF8Encoding(true);
+    public static byte[] ToBytes(this string str) => UTF8.GetBytes(str);
     public static byte[] ToBytes(this string str, Encoding encoding) => encoding.GetBytes(str);
+    public static string BytesToString(this byte[] bytes) => UTF8.GetString(bytes);
     public static string BytesToString(this byte[] bytes, Encoding encoding) => encoding.GetString(bytes);
 
     // хеш в виде массива байт в строку (хеш изначально не в кодировке UTF8, так что метод выше не работает с ним)
@@ -160,7 +162,7 @@ public static class StringConverter
     public static List<string> SplitToList(this string s, int length)
     {
         List<string> parts = new();
-        int max = (s.Length / length).Truncate();
+        int max = (int)(s.Length / length);
         for (int i = 0; i < max; i++)
             parts.Add(s.Substring(i * length, length));
         if (max * length != s.Length) parts.Add(s.Substring(max * length, s.Length - max * length));
diff --git a/DTLib/Extensions/StrugBuilderExtensions.cs b/DTLib/Extensions/StrugBuilderExtensions.cs
index a8ea145..d39f53a 100644
--- a/DTLib/Extensions/StrugBuilderExtensions.cs
+++ b/DTLib/Extensions/StrugBuilderExtensions.cs
@@ -8,7 +8,7 @@ public static class StrugBuilderExtensions
             b.Append(array[i]);
         return b;
     }
-    public static StringBuilder AppendArray<TVal,TSep>(this StringBuilder b, TVal[] array, char separator)
+    public static StringBuilder AppendArray<TVal>(this StringBuilder b, TVal[] array, char separator)
     {
         if (array.Length == 0) return b;
         b.Append(array[0]);
@@ -16,7 +16,7 @@ public static class StrugBuilderExtensions
             b.Append(separator).Append(array[i]);
         return b;
     }
-    public static StringBuilder AppendArray<TVal,TSep>(this StringBuilder b, TVal[] array, string separator)
+    public static StringBuilder AppendArray<TVal>(this StringBuilder b, TVal[] array, string separator)
     {
         if (array.Length == 0) return b;
         b.Append(array[0]);
@@ -31,7 +31,7 @@ public static class StrugBuilderExtensions
             b.Append(el);
         return b;
     }
-    public static StringBuilder AppendColletion<TVal, TSep>(this StringBuilder b, IEnumerable<TVal> enumerable, char separator)
+    public static StringBuilder AppendColletion<TVal>(this StringBuilder b, IEnumerable<TVal> enumerable, char separator)
     {
         using IEnumerator<TVal> enumerator = enumerable.GetEnumerator();
         if (!enumerator.MoveNext()) return b;
@@ -40,7 +40,7 @@ public static class StrugBuilderExtensions
             b.Append(separator).Append(enumerator.Current);
         return b;
     }
-    public static StringBuilder AppendColletion<TVal, TSep>(this StringBuilder b, IEnumerable<TVal> enumerable, string separator)
+    public static StringBuilder AppendColletion<TVal>(this StringBuilder b, IEnumerable<TVal> enumerable, string separator)
     {
         using IEnumerator<TVal> enumerator = enumerable.GetEnumerator();
         if (!enumerator.MoveNext()) return b;
diff --git a/DTLib/Logging/FileLogger.cs b/DTLib/Logging/FileLogger.cs
index b0c5ade..844a810 100644
--- a/DTLib/Logging/FileLogger.cs
+++ b/DTLib/Logging/FileLogger.cs
@@ -21,20 +21,19 @@ public class FileLogger : IDisposable
         lock (LogfileStream)
         {
             LastLogMessageTime = DateTime.Now.ToString(MyTimeFormat.ForText);
-            LogfileStream.WriteByte('['.ToByte());
-            LogfileStream.Write(LastLogMessageTime.ToBytes(StringConverter.UTF8));
-            LogfileStream.Write("]: ".ToBytes(StringConverter.UTF8));
+            LogfileStream.FluentWriteString("[")
+                .FluentWriteString(LastLogMessageTime)
+                .FluentWriteString("]: ");
             if (msg.Length == 1)
-                LogfileStream.Write(msg[0].ToBytes(StringConverter.UTF8));
+                LogfileStream.FluentWriteString(msg[0]);
             else
             {
                 var strb = new StringBuilder();
                 for (ushort i = 1; i < msg.Length; i += 2)
                     strb.Append(msg[i]);
-                LogfileStream.Write(strb.ToString().ToBytes(StringConverter.UTF8));
+                LogfileStream.FluentWriteString(strb.ToString());
             }
-            LogfileStream.WriteByte('\n'.ToByte());
-            LogfileStream.Flush();
+            LogfileStream.FluentWriteString("\n").Flush();
         }
     }