diff --git a/ChunkManager.cpp b/ChunkManager.cpp
index e6b28ab..e443766 100644
--- a/ChunkManager.cpp
+++ b/ChunkManager.cpp
@@ -65,7 +65,7 @@ std::vector<char> ChunkManager::chunked(const std::vector<char>& raw, const bool
 // Kompresja
 std::vector<char> ChunkManager::compress_data(const std::vector<char>& input)
 {
-	const int level = 3;
+	const int level = COMPRESSION_LEVEL;
 
 	// Obs³uga pustego chunku: zwracamy pusty wynik (0 bajtów).
 	if (input.empty()) return {};
diff --git a/ChunkManager.h b/ChunkManager.h
index 03cafa5..3a2b83c 100644
--- a/ChunkManager.h
+++ b/ChunkManager.h
@@ -3,7 +3,6 @@
 #include <vector>
 #include <cstdint>
 #include <cstring>
-#include <lz4.h>
 #include <stdexcept>
 #include <algorithm>
 #include <iostream>
@@ -17,6 +16,7 @@
 #include "EncryptionManager.h"
 
 #define BLOCK_SIZE          131072 // 128KB
+#define COMPRESSION_LEVEL   3
 
 struct BlockSize
 {
diff --git a/ExtractCargo.cpp b/ExtractCargo.cpp
index 5237e44..13bde7f 100644
--- a/ExtractCargo.cpp
+++ b/ExtractCargo.cpp
@@ -139,12 +139,12 @@ bool ExtractCargo::HashValid(const std::vector<char>& data, const uint64_t& crc)
 //-----------------------------------------------------------------------------
 void ExtractCargo::computingBytes(const std::vector<char>& input, std::vector<char>& output, const int16_t& flag)
 {
-	CompressingManager cm(eman);
+	ChunkManager cm(eman);
 	
 	switch (flag)
 	{
 	case 1:
-		output = cm.decompress(input, false);
+		output = cm.dechunked(input, false);
 		break;
 	
 	case 2:
@@ -152,7 +152,7 @@ void ExtractCargo::computingBytes(const std::vector<char>& input, std::vector<ch
 		break;
 	
 	case 3:
-		output = cm.decompress(input, false);
+		output = cm.dechunked(input, false);
 		break;
 	
 	default:
diff --git a/voidcmd.vcxproj b/voidcmd.vcxproj
index ede51e0..cfb9278 100644
--- a/voidcmd.vcxproj
+++ b/voidcmd.vcxproj
@@ -104,13 +104,13 @@
       <PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
       <LanguageStandard>stdcpp17</LanguageStandard>
-      <AdditionalIncludeDirectories>3rd\ftxui\include;3rd\libsodium\include;3rd\json\include;3rd\zstd\include;3rd\lz4\include;3rd\xxhash\include</AdditionalIncludeDirectories>
+      <AdditionalIncludeDirectories>3rd\ftxui\include;3rd\libsodium\include;3rd\json\include;3rd\zstd\include;3rd\xxhash\include;3rd\xxhash\include</AdditionalIncludeDirectories>
     </ClCompile>
     <Link>
       <SubSystem>Console</SubSystem>
       <GenerateDebugInformation>true</GenerateDebugInformation>
-      <AdditionalLibraryDirectories>3rd\zstd\lib\Debug;3rd\ftxui\Debug;3rd\lz4\lib;3rd\libsodium\lib\Debug</AdditionalLibraryDirectories>
-      <AdditionalDependencies>liblz4_static.lib;ftxui-component.lib;ftxui-dom.lib;ftxui-screen.lib;libsodium.lib;zstd_static.lib</AdditionalDependencies>
+      <AdditionalLibraryDirectories>3rd\zstd\lib\Debug;3rd\ftxui\Debug;3rd\xxhash\lib\Debug;3rd\libsodium\lib\Debug</AdditionalLibraryDirectories>
+      <AdditionalDependencies>ftxui-component.lib;ftxui-dom.lib;ftxui-screen.lib;libsodium.lib;zstd_static.lib;xxhash.lib</AdditionalDependencies>
     </Link>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
@@ -122,13 +122,13 @@
       <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
       <LanguageStandard>stdcpp17</LanguageStandard>
-      <AdditionalIncludeDirectories>3rd\ftxui\include;3rd\libsodium\include;3rd\json\include;3rd\zstd\include;3rd\lz4\include;</AdditionalIncludeDirectories>
+      <AdditionalIncludeDirectories>3rd\ftxui\include;3rd\libsodium\include;3rd\json\include;3rd\zstd\include;3rd\xxhash\include;</AdditionalIncludeDirectories>
     </ClCompile>
     <Link>
       <SubSystem>Console</SubSystem>
       <GenerateDebugInformation>true</GenerateDebugInformation>
-      <AdditionalLibraryDirectories>3rd\zstd\lib\Release;3rd\libsodium\lib\Release;3rd\ftxui\Release;3rd\lz4\lib</AdditionalLibraryDirectories>
-      <AdditionalDependencies>liblz4_static.lib;ftxui-component.lib;ftxui-dom.lib;ftxui-screen.lib;libsodium.lib;zstd_static.lib</AdditionalDependencies>
+      <AdditionalLibraryDirectories>3rd\zstd\lib\Release;3rd\libsodium\lib\Release;3rd\xxhash\lib\Release;3rd\ftxui\Release</AdditionalLibraryDirectories>
+      <AdditionalDependencies>ftxui-component.lib;ftxui-dom.lib;ftxui-screen.lib;libsodium.lib;zstd_static.lib;xxhash.lib</AdditionalDependencies>
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
diff --git a/xxhash.dll b/xxhash.dll
new file mode 100644
index 0000000..4ee9ba0
Binary files /dev/null and b/xxhash.dll differ