diff --git a/zlib.vcxproj b/zlib.vcxproj
index d0fbe84..f8449df 100644
--- a/zlib.vcxproj
+++ b/zlib.vcxproj
@@ -172,7 +172,7 @@ copy $(TargetPath) \EgtProg\DllD64</Command>
       <ProgramDataBaseFileName>$(IntDir)vc$(PlatformToolsetVersion).pdb</ProgramDataBaseFileName>
       <WarningLevel>Level3</WarningLevel>
       <SuppressStartupBanner>true</SuppressStartupBanner>
-      <Optimization>Full</Optimization>
+      <Optimization>MaxSpeed</Optimization>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
       <EnableEnhancedInstructionSet>StreamingSIMDExtensions2</EnableEnhancedInstructionSet>
@@ -212,7 +212,7 @@ copy $(TargetPath) \EgtProg\Dll32</Command>
       <ProgramDataBaseFileName>$(IntDir)vc$(PlatformToolsetVersion).pdb</ProgramDataBaseFileName>
       <WarningLevel>Level3</WarningLevel>
       <SuppressStartupBanner>true</SuppressStartupBanner>
-      <Optimization>Full</Optimization>
+      <Optimization>MaxSpeed</Optimization>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
       <OmitFramePointers>false</OmitFramePointers>