diff --git a/SoulstormReplayReader.Core/Extensions/Extensions.cs b/SoulstormReplayReader.Core/Extensions/Extensions.cs
index ed674b5..8eed57d 100644
--- a/SoulstormReplayReader.Core/Extensions/Extensions.cs
+++ b/SoulstormReplayReader.Core/Extensions/Extensions.cs
@@ -26,20 +26,24 @@ public static class Extensions
         return span[..i];
     }
 
-    public static ExBinaryReader NextAsciiStringMustEqual(this ExBinaryReader binReader, string text)
+    public static ExBinaryReader NextAsciiStringMustEqual(this ExBinaryReader binReader, ReadOnlySpan<byte> text)
     {
         if (!binReader.IsNextAsciiStringEquals(text))
         {
-            throw new Exception(text + "Нарушение структуры файла. ");
+            throw new Exception(Encoding.ASCII.GetString(text) + "Нарушение структуры файла. ");
         }
 
         return binReader;
     }
 
-    public static bool IsNextAsciiStringEquals(this ExBinaryReader binReader, string text)
+    public static bool IsNextAsciiStringEquals(this ExBinaryReader binReader, ReadOnlySpan<byte> textSpan)
     {
-        Span<byte> textSpan = Encoding.ASCII.GetBytes(text);
-        var nextTextSpan = binReader.ReadBytes(stackalloc byte[text.Length]);
+        var nextTextSpan = binReader.ReadBytes(stackalloc byte[textSpan.Length]);
+
+        if (textSpan.SequenceEqual(nextTextSpan))
+        {
+            return true;
+        }
 
         return textSpan.Length == nextTextSpan.Length && SpansEqualInvariant(textSpan, nextTextSpan);
 
diff --git a/SoulstormReplayReader.Core/SsReplayReader.cs b/SoulstormReplayReader.Core/SsReplayReader.cs
index 8ac8637..3f95e48 100644
--- a/SoulstormReplayReader.Core/SsReplayReader.cs
+++ b/SoulstormReplayReader.Core/SsReplayReader.cs
@@ -95,14 +95,14 @@ public sealed class SsReplayReader(Stream stream) : IDisposable
 
         _binaryReader // relic chunky
             .Skip(44)
-            .NextAsciiStringMustEqual("POSTGAMEINFO\0DATADATA")
+            .NextAsciiStringMustEqual("POSTGAMEINFO\0DATADATA"u8)
             .SkipInt32(3);
 
         Replay.TotalTicks = _binaryReader.ReadInt32(); // Полное игровое время (1 сек = 8 тиков)
 
         _binaryReader // relic chunky
             .Skip(24)
-            .NextAsciiStringMustEqual("FOLDINFO")
+            .NextAsciiStringMustEqual("FOLDINFO"u8)
             .SkipInt32();
 
         Descriptor.FoldInfoStart = _binaryReader.Position; // 153
@@ -110,7 +110,7 @@ public sealed class SsReplayReader(Stream stream) : IDisposable
 
         _binaryReader
             .SkipInt32()
-            .NextAsciiStringMustEqual("GAMEINFO\0FOLDWMAN")
+            .NextAsciiStringMustEqual("GAMEINFO\0FOLDWMAN"u8)
             .SkipInt32();
 
         Descriptor.FoldWmanStart = _binaryReader.Position; // 182
@@ -118,7 +118,7 @@ public sealed class SsReplayReader(Stream stream) : IDisposable
 
         _binaryReader
             .SkipInt32()
-            .NextAsciiStringMustEqual("DATASDSC")
+            .NextAsciiStringMustEqual("DATASDSC"u8)
             .Skip(20);
 
         Replay.Map.MaxPlayersCount = _binaryReader.ReadInt32();
@@ -144,7 +144,7 @@ public sealed class SsReplayReader(Stream stream) : IDisposable
 
         _binaryReader
             .SkipInt32(4)
-            .NextAsciiStringMustEqual("DATABASE")
+            .NextAsciiStringMustEqual("DATABASE"u8)
             .SkipInt32();
 
         Descriptor.BeginDataBaseChunkSize = _binaryReader.Position;
@@ -252,7 +252,7 @@ public sealed class SsReplayReader(Stream stream) : IDisposable
     private PlayerModel ReadPlayer()
     {
         // В реплеях c ботами нет пустых мест
-        if (!_binaryReader.IsNextAsciiStringEquals("FOLDGPLY"))
+        if (!_binaryReader.IsNextAsciiStringEquals("FOLDGPLY"u8))
         {
             _binaryReader.Skip(-8);
             return PlayerModel.Empty;
@@ -263,7 +263,7 @@ public sealed class SsReplayReader(Stream stream) : IDisposable
 
         _binaryReader
             .Skip(12) // int32 version 2; int32 size; int32 strLen 0;
-            .NextAsciiStringMustEqual("DATAINFO")
+            .NextAsciiStringMustEqual("DATAINFO"u8)
             .Skip(12); // int32 version 1; int32 size; int32 strLen 0;
 
         player.Name = _binaryReader.ReadNextUnicodeString();
@@ -279,11 +279,11 @@ public sealed class SsReplayReader(Stream stream) : IDisposable
         if (!_binaryReader.HasBytes)
             return player;
 
-        if (_binaryReader.IsNextAsciiStringEquals("FOLDTCUC"))
+        if (_binaryReader.IsNextAsciiStringEquals("FOLDTCUC"u8))
         {
             _binaryReader
                 .Skip(12) // int32 version 1; int32 size; int32 strLen 0;
-                .NextAsciiStringMustEqual("DATALCIN")
+                .NextAsciiStringMustEqual("DATALCIN"u8)
                 .Skip(4); // int32 version 2;
 
             _binaryReader.ReadNextAsciiString(); // описание раскрасок отправителя реплея?
@@ -292,7 +292,7 @@ public sealed class SsReplayReader(Stream stream) : IDisposable
 
             _binaryReader
                 .Skip(4) // int32 strLen 0;
-                .NextAsciiStringMustEqual("DATAUNCU") // 42192
+                .NextAsciiStringMustEqual("DATAUNCU"u8) // 42192
                 .Skip(12); // int32 version 1; int32 size; int32 strLen 0;
 
             player.ColorScheme = new ColorScheme
@@ -338,13 +338,13 @@ public sealed class SsReplayReader(Stream stream) : IDisposable
                 }
 
                 _binaryReader
-                    .NextAsciiStringMustEqual("FOLDIMAG")
+                    .NextAsciiStringMustEqual("FOLDIMAG"u8)
                     .Skip(8); // int32 version 1; int32 size;
 
                 playerImage.Name = _binaryReader.ReadNextAsciiString();
 
                 _binaryReader
-                    .NextAsciiStringMustEqual("DATAATTR")
+                    .NextAsciiStringMustEqual("DATAATTR"u8)
                     .Skip(16); // int32 version 2; int32 size; 2 * int32 (?) 0;
 
                 var width = _binaryReader.ReadInt32();
@@ -352,7 +352,7 @@ public sealed class SsReplayReader(Stream stream) : IDisposable
 
                 _binaryReader
                     .Skip(4) // int32 (?) 1;
-                    .NextAsciiStringMustEqual("DATADATA")
+                    .NextAsciiStringMustEqual("DATADATA"u8)
                     .Skip(12); // int32 version 2; int32 size; int32 (?) 0;
 
                 playerImage.Init(width, height);