diff --git a/ext/zlib/zlib.vcxproj b/ext/zlib/zlib.vcxproj
index 1738d1ae8d..d1f39a5ff7 100644
--- a/ext/zlib/zlib.vcxproj
+++ b/ext/zlib/zlib.vcxproj
@@ -98,8 +98,14 @@
       <PrecompiledHeader>
       </PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
-      <Optimization>Disabled</Optimization>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>WIN32;_DEBUG;_LIB;%(PreprocessorDefinitions);_CRT_SECURE_NO_WARNINGS</PreprocessorDefinitions>
+      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
+      <EnableEnhancedInstructionSet>StreamingSIMDExtensions2</EnableEnhancedInstructionSet>
+      <FloatingPointModel>Fast</FloatingPointModel>
+      <BasicRuntimeChecks>Default</BasicRuntimeChecks>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -111,8 +117,15 @@
       <PrecompiledHeader>
       </PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
-      <Optimization>Disabled</Optimization>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>WIN32;_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
+      <OmitFramePointers>false</OmitFramePointers>
+      <EnableEnhancedInstructionSet>StreamingSIMDExtensions2</EnableEnhancedInstructionSet>
+      <FloatingPointModel>Fast</FloatingPointModel>
+      <BasicRuntimeChecks>Default</BasicRuntimeChecks>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -132,6 +145,7 @@
       <BufferSecurityCheck>false</BufferSecurityCheck>
       <FloatingPointModel>Fast</FloatingPointModel>
       <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
+      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -150,6 +164,11 @@
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <PreprocessorDefinitions>WIN32;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <BufferSecurityCheck>false</BufferSecurityCheck>
+      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
+      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
+      <OmitFramePointers>false</OmitFramePointers>
+      <EnableEnhancedInstructionSet>StreamingSIMDExtensions2</EnableEnhancedInstructionSet>
+      <FloatingPointModel>Fast</FloatingPointModel>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>