diff --git a/minecraft-launcher-client/Network.cs b/minecraft-launcher-client/Network.cs
index b7fb0b2..6dd7469 100644
--- a/minecraft-launcher-client/Network.cs
+++ b/minecraft-launcher-client/Network.cs
@@ -1,4 +1,5 @@
-using System.Net;
+using System;
+using System.Net;
 using System.Net.Sockets;
 using System.Threading;
 using DTLib;
@@ -7,6 +8,7 @@ using DTLib.Extensions;
 using DTLib.Filesystem;
 using DTLib.Logging;
 using DTLib.Network;
+using DTLib.XXHash;
 using static launcher_client.Launcher;
 
 namespace launcher_client;
@@ -57,15 +59,26 @@ public class Network
         string manifestContent = Fsp.DownloadFileToMemory(manifestPath).BytesToString();
         Logger.LogDebug(nameof(Network), manifestContent);
         var manifest = new DtsodV23(manifestContent);
-        var hasher = new Hasher();
         foreach (var fileOnServerData in manifest)
         {
             IOPath fileOnClient = Path.Concat(dirOnClient, fileOnServerData.Key);
-            if (!File.Exists(fileOnClient) || (overwrite && hasher.HashFile(fileOnClient).HashToString() != fileOnServerData.Value))
+            if (!File.Exists(fileOnClient))
             {
                 Logger.LogDebug(nameof(Network), $"downloading {fileOnClient}");
                 Fsp.DownloadFile(Path.Concat(dirOnServer, fileOnServerData.Key), fileOnClient);
             }
+            else if (overwrite)
+            {
+                var fileStream = File.OpenRead(fileOnClient);
+                ulong hash = xxHash64.ComputeHash(fileStream);
+                fileStream.Close();
+                string hashStr = BitConverter.GetBytes(hash).HashToString();
+                if (hashStr != fileOnServerData.Value)
+                {
+                    Logger.LogDebug(nameof(Network), $"downloading {fileOnClient} (hash {hashStr} != {fileOnServerData.Value})");
+                    Fsp.DownloadFile(Path.Concat(dirOnServer, fileOnServerData.Key), fileOnClient);
+                }
+            }
         }
         // удаление лишних файлов
         if (delete_excess)
diff --git a/minecraft-launcher-client/launcher-client.csproj b/minecraft-launcher-client/launcher-client.csproj
index 41812ab..49b8cee 100644
--- a/minecraft-launcher-client/launcher-client.csproj
+++ b/minecraft-launcher-client/launcher-client.csproj
@@ -23,8 +23,9 @@
       <PackageReference Include="Costura.Fody" Version="5.7.0">
         <PrivateAssets>all</PrivateAssets>
       </PackageReference>
-      <PackageReference Include="DTLib.Dtsod" Version="1.3.3" />
-      <PackageReference Include="DTLib.Logging" Version="1.3.3" />
-      <PackageReference Include="DTLib.Network" Version="1.4.1" />
+      <PackageReference Include="DTLib.Dtsod" Version="1.3.4" />
+      <PackageReference Include="DTLib.Logging" Version="1.3.4" />
+      <PackageReference Include="DTLib.Network" Version="1.4.2" />
+      <PackageReference Include="DTLib.XXHash" Version="1.0.0" />
     </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/minecraft-launcher-server/Manifests.cs b/minecraft-launcher-server/Manifests.cs
index 540810c..ca3c709 100644
--- a/minecraft-launcher-server/Manifests.cs
+++ b/minecraft-launcher-server/Manifests.cs
@@ -1,8 +1,5 @@
 using System.Linq;
-using System.Text;
-using DTLib;
-using DTLib.Extensions;
-using DTLib.Filesystem;
+using DTLib.XXHash;
 using static launcher_server.Server;
 
 namespace launcher_server;
@@ -20,7 +17,6 @@ public static class Manifests
         }
         
         StringBuilder manifestBuilder = new();
-        Hasher hasher = new();
         var manifestPath = Path.Concat(dir, "manifest.dtsod");
         if (Directory.GetFiles(dir).Contains(manifestPath))
             File.Delete(manifestPath);
@@ -29,8 +25,11 @@ public static class Manifests
             var fileRelative = fileInDir.RemoveBase(dir);
             manifestBuilder.Append(fileRelative);
             manifestBuilder.Append(": \"");
-            byte[] hash = hasher.HashFile(Path.Concat(fileInDir));
-            manifestBuilder.Append(hash.HashToString());
+            var fileStream = File.OpenRead(fileInDir);
+            ulong hash = xxHash64.ComputeHash(fileStream);
+            fileStream.Close();
+            string hashStr = BitConverter.GetBytes(hash).HashToString();
+            manifestBuilder.Append(hashStr);
             manifestBuilder.Append("\";\n");
         }
         File.WriteAllText(manifestPath, manifestBuilder.ToString().Replace('\\','/'));
@@ -59,7 +58,7 @@ public static class Manifests
             }
             dirlist_content_builder
                 .Append("\t\"")
-                .Append(dirs[dirs.Length-1].RemoveBase(sync_and_remove_dir).Str.Replace('\\','/'))
+                .Append(dirs[^1].RemoveBase(sync_and_remove_dir).Str.Replace('\\','/'))
                 .Append("\"\n");
 
             dirlist_content_builder.Append("];");
diff --git a/minecraft-launcher-server/launcher-server.csproj b/minecraft-launcher-server/launcher-server.csproj
index a047f49..e8c12f9 100644
--- a/minecraft-launcher-server/launcher-server.csproj
+++ b/minecraft-launcher-server/launcher-server.csproj
@@ -12,8 +12,9 @@
     <InvariantGlobalization>true</InvariantGlobalization>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="DTLib.Dtsod" Version="1.3.3" />
-    <PackageReference Include="DTLib.Logging" Version="1.3.3" />
-    <PackageReference Include="DTLib.Network" Version="1.4.1" />
+    <PackageReference Include="DTLib.Dtsod" Version="1.3.4" />
+    <PackageReference Include="DTLib.Logging" Version="1.3.4" />
+    <PackageReference Include="DTLib.Network" Version="1.4.2" />
+    <PackageReference Include="DTLib.XXHash" Version="1.0.0" />
   </ItemGroup>
 </Project>
\ No newline at end of file