diff --git a/.github/workflows/dos-djgpp.yml b/.github/workflows/dos-djgpp.yml
index ee968c3..f267223 100644
--- a/.github/workflows/dos-djgpp.yml
+++ b/.github/workflows/dos-djgpp.yml
@@ -188,3 +188,121 @@ jobs:
         with:
           name: UMSKT-DOS-x86
           path: build/actions_upload
+  compress:
+    needs: build
+    if: success()
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+    steps:
+      - name: Setup test environment
+        run: |
+          sudo apt -y update
+          sudo apt -y install dosbox
+          
+      - name: Download artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: UMSKT-DOS-x86
+          path: .
+
+      - name: Install UPX
+        uses: crazy-max/ghaction-upx@v3
+        with:
+          install-only: true
+          
+      - name: Compress binary
+        shell: pwsh
+        run: |
+          upx umskt.exe --best --ultra-brute -v
+          
+      - name: Setup DOSBox test environment
+        run: |
+          mkdir -p dosbox_test
+          cp umskt.exe dosbox_test/
+          # Download DPMI server directly
+          # wget https://github.com/UMSKT/winactiontest/raw/refs/heads/main/CWSDPMI.EXE -O dosbox_test/CWSDPMI.EXE
+          # Create test batch file
+          cat > dosbox_test/test.bat << EOL
+          @echo off
+          echo Running test 1...
+          umskt.exe -b 2C -c 365 -s 069420 > TEST1.TXT
+          if errorlevel 1 goto error
+          echo Running test 2...
+          umskt.exe -i 253286028742154311079061239762245184619981623171292574 > TEST2.TXT
+          if errorlevel 1 goto error
+          echo Tests completed > DONE.TXT
+          goto end
+          :error
+          echo Test failed > ERROR.TXT
+          :end
+          exit
+          EOL
+          # Create DOSBox configuration
+          cat > dosbox_test/dosbox.conf << EOL
+          [sdl]
+          nosound=true
+          [cpu]
+          cputype=386
+          core=dynamic
+          cycles=max
+          [autoexec]
+          mount c .
+          c:
+          test.bat
+          exit
+          EOL
+
+      - name: Run tests in DOSBox
+      
+        run: |
+          cd dosbox_test
+          timeout 30s dosbox -conf dosbox.conf -nogui -exit
+          # Check if the test completed successfully
+          if [ ! -f DONE.TXT ]; then
+            echo "Tests did not complete successfully"
+            if [ -f ERROR.TXT ]; then
+              echo "Test execution failed"
+            fi
+            if [ -f TEST1.TXT ]; then
+              echo "Test 1 output:"
+              cat TEST1.TXT
+            fi
+            if [ -f TEST2.TXT ]; then
+              echo "Test 2 output:"
+              cat TEST2.TXT
+            fi
+            exit 1
+          fi
+          # Verify test outputs
+          if [ ! -f TEST1.TXT ] || [ ! -f TEST2.TXT ]; then
+            echo "Test output files missing"
+            exit 1
+          fi
+          # Check test results - looking for key format patterns
+          if ! grep -qE '[A-Z0-9]{5}-[A-Z0-9]{5}-[A-Z0-9]{5}-[A-Z0-9]{5}-[A-Z0-9]{5}' TEST1.TXT || \
+             ! grep -qE '[0-9]{6}-[0-9]{6}-[0-9]{6}-[0-9]{6}-[0-9]{6}-[0-9]{6}-[0-9]{6}' TEST2.TXT; then
+            echo "Tests failed - unexpected output format"
+            echo "Test 1 output:"
+            cat TEST1.TXT
+            echo "Test 2 output:"
+            cat TEST2.TXT
+            exit 1
+          else
+            echo "All tests passed successfully"
+            echo "Test 1 output:"
+            cat TEST1.TXT
+            echo "Test 2 output:"
+            cat TEST2.TXT
+          fi
+
+      - name: Move executable to upload directory
+        run: |
+          mkdir actions_upload
+          mv umskt.exe actions_upload/
+          
+      - name: Upload build artifact
+        uses: actions/upload-artifact@v4.6.2
+        with:
+          name: UMSKT-DOS-x86-Compressed
+          path: actions_upload
diff --git a/.github/workflows/windows-x86-x64.yml b/.github/workflows/windows-x86-x64.yml
index f4b3062..9afa794 100644
--- a/.github/workflows/windows-x86-x64.yml
+++ b/.github/workflows/windows-x86-x64.yml
@@ -98,9 +98,9 @@ jobs:
           cd openssl-1.1.1
 
           if [[ ${{ matrix.arch }} == "x86" ]]; then
-              /usr/bin/perl Configure mingw --prefix=$(cygpath -u "$GITHUB_WORKSPACE")/OpenSSL-TDM-${{ matrix.arch }} --openssldir=$(cygpath -u "$GITHUB_WORKSPACE")/OpenSSL-TDM-32 no-tests no-sse2 no-asm no-threads -DOPENSSL_DEV_NO_ATOMICS -mno-mmx -mno-sse -mno-sse2 -march=i686 -mtune=generic
+              /usr/bin/perl Configure mingw --prefix=$(cygpath -u "$GITHUB_WORKSPACE")/OpenSSL-TDM-${{ matrix.arch }} --openssldir=$(cygpath -u "$GITHUB_WORKSPACE")/OpenSSL-TDM-32 no-tests no-sse2 no-asm no-threads -DOPENSSL_DEV_NO_ATOMICS -mno-mmx -mno-sse -mno-sse2 -march=i686 -mtune=generic -Os -s -fno-exceptions -fno-rtti -fno-unwind-tables -fno-asynchronous-unwind-tables -ffunction-sections -fdata-sections -fno-stack-protector
           else
-              /usr/bin/perl Configure mingw64 --prefix=$(cygpath -u "$GITHUB_WORKSPACE")/OpenSSL-TDM-${{ matrix.arch }} --openssldir=$(cygpath -u "$GITHUB_WORKSPACE")/OpenSSL-TDM-64 no-tests no-asm -DOPENSSL_DEV_NO_ATOMICS -mno-mmx
+              /usr/bin/perl Configure mingw64 --prefix=$(cygpath -u "$GITHUB_WORKSPACE")/OpenSSL-TDM-${{ matrix.arch }} --openssldir=$(cygpath -u "$GITHUB_WORKSPACE")/OpenSSL-TDM-64 no-tests no-asm -DOPENSSL_DEV_NO_ATOMICS -mno-mmx -Os -s -fno-exceptions -fno-rtti -fno-unwind-tables -fno-asynchronous-unwind-tables -ffunction-sections -fdata-sections -fno-stack-protector
           fi
           mingw32-make -j
           mingw32-make install_sw
@@ -158,3 +158,78 @@ jobs:
         with:
           name: UMSKT-WinNT-${{ matrix.arch }}
           path: umskt.exe 
+
+  compress:
+    needs: build
+    if: success()
+    runs-on: windows-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - arch: x86
+          - arch: x64
+    steps:
+      - name: Setup TDM-GCC
+        run: |
+          Write-Host Downloading TDM-GCC v10.3.0...
+          Invoke-WebRequest -Uri 'https://github.com/jmeubank/tdm-gcc/releases/download/v10.3.0-tdm64-2/tdm64-gcc-10.3.0-2.exe' -OutFile 'C:\Windows\temp\TDM-GCC-64.exe'
+          Write-Host Creating directory...
+          New-Item -ItemType Directory -Path 'C:\TDM-GCC-64'
+          Write-Host Copying files [Set 1/3]...
+          Start-Process '7z' -ArgumentList 'e C:\Windows\temp\TDM-GCC-64.exe -oC:\TDM-GCC-64 -y' -Wait
+          Write-Host Copying files [Set 2/3]...
+          Start-Process '7z' -ArgumentList 'e C:\TDM-GCC-64\*.tar.xz -oC:\TDM-GCC-64 -y' -Wait
+          Write-Host Copying files [Set 3/3]...
+          Start-Process '7z' -ArgumentList 'x C:\TDM-GCC-64\*.tar -oC:\TDM-GCC-64 -y' -Wait
+          Write-Host Adding environment variables...
+          $env:PATH = 'C:\TDM-GCC-64\bin;' + $env:PATH
+          [Environment]::SetEnvironmentVariable('PATH', $env:PATH, [EnvironmentVariableTarget]::Machine)
+          
+      - name: Setup UPX
+        run: |
+          Invoke-WebRequest -Uri 'https://github.com/upx/upx/releases/download/v5.0.2/upx-5.0.2-win64.zip' -OutFile 'C:\Windows\temp\upx.zip'
+          Write-Host Creating directory...
+          New-Item -ItemType Directory -Path 'C:\UPX'
+          Write-Host Copying files...
+          Expand-Archive -Path 'C:\Windows\temp\upx.zip' -DestinationPath 'C:\UPX'
+          Write-Host Adding environment variables...
+          $env:PATH = 'C:\UPX\upx-5.0.2-win64;' + $env:PATH
+          [Environment]::SetEnvironmentVariable('PATH', $env:PATH, [EnvironmentVariableTarget]::Machine)
+        
+      - name: Download ${{matrix.arch}} artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: UMSKT-WinNT-${{ matrix.arch }}
+          path: .
+      - name: Compress binaries
+        shell: pwsh
+        run: |
+          # Strip symbols
+          strip .\umskt.exe
+
+          # Remove resources
+          llvm-objcopy --remove-section .rsrc umskt.exe umskt_comp.exe
+
+          # Compress with UPX
+          & "C:\UPX\upx-5.0.2-win64\upx.exe" --best --ultra-brute .\umskt_comp.exe
+
+          # Replace original EXE
+          Remove-Item .\umskt.exe
+          Rename-Item -Path .\umskt_comp.exe -NewName umskt.exe
+
+
+    
+      - name: Run tests
+        shell: pwsh
+        run: |
+          Write-Host Test 1 - generating key
+          .\umskt.exe -b 2C -c 365 -s 069420 -v
+          Write-Host Test 2 - generatng confid
+          .\umskt.exe -i 253286028742154311079061239762245184619981623171292574 
+          
+      - name: Upload build artifact
+        uses: actions/upload-artifact@v4.6.2
+        with:
+          name: UMSKT-WinNT-${{ matrix.arch }}-Compressed
+          path: umskt.exe
diff --git a/CMakeLists.txt b/CMakeLists.txt
index fb6af08..7bcc8bb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,6 +27,11 @@ if (WIN32 AND NOT MSVC)
     set(CMAKE_CXX_COMPILER "C:/TDM-GCC-64/bin/g++.exe" CACHE FILEPATH "C++ Compiler" FORCE)
     message(STATUS "[UMSKT] Forcing use of TDM-GCC in C:/TDM-GCC-64")
     
+    # Add size optimization flags for GCC
+    set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -Os -s -fno-exceptions -fno-rtti -fno-unwind-tables -fno-asynchronous-unwind-tables -ffunction-sections -fdata-sections -fno-stack-protector")
+    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -Os -s -fno-exceptions -fno-rtti -fno-unwind-tables -fno-asynchronous-unwind-tables -ffunction-sections -fdata-sections -fno-stack-protector")
+    set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} -Wl,--gc-sections -Wl,--strip-all")
+    
     # Configure windres for resource compilation
     set(CMAKE_RC_COMPILER "C:/TDM-GCC-64/bin/windres.exe")
     set(CMAKE_RC_COMPILER_INIT windres)
@@ -123,13 +128,13 @@ ENDIF()
 IF(MSVC)
     SET(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
     IF(NOT BUILD_SHARED_LIBS)
-        SET(CMAKE_CXX_FLAGS_RELEASE "/MT")
+        SET(CMAKE_CXX_FLAGS_RELEASE "/MT /Os /GL /GS- /Gy")
         SET(CMAKE_CXX_FLAGS_DEBUG "/MTd")
     ELSE()
-        SET(CMAKE_CXX_FLAGS_RELEASE "/MD")
+        SET(CMAKE_CXX_FLAGS_RELEASE "/MD /Os /GL /GS- /Gy")
         SET(CMAKE_CXX_FLAGS_DEBUG "/MDd")
     ENDIF()
-    SET(CMAKE_EXE_LINKER_FLAGS "/INCREMENTAL:NO /NODEFAULTLIB:MSVCRT")
+    SET(CMAKE_EXE_LINKER_FLAGS "/INCREMENTAL:NO /NODEFAULTLIB:MSVCRT /OPT:REF /OPT:ICF")
     SET(CMAKE_ENABLE_EXPORTS ON)
     SET(UMSKT_EXE_WINDOWS_EXTRA src/windows/umskt.rc)
     SET(UMSKT_EXE_WINDOWS_DLL src/windows/dllmain.cpp)