diff --git a/ide/vs2019/mimalloc-override.vcxproj b/ide/vs2019/mimalloc-override.vcxproj
index 1f3b7ee2..33c9ee55 100644
--- a/ide/vs2019/mimalloc-override.vcxproj
+++ b/ide/vs2019/mimalloc-override.vcxproj
@@ -135,7 +135,7 @@
     </PostBuildEvent>
     <Link>
       <EntryPointSymbol>DllEntry</EntryPointSymbol>
-      <AdditionalDependencies>kernel32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>kernel32.lib;..\..\bin\mimalloc-redirect.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <IgnoreSpecificDefaultLibraries>
       </IgnoreSpecificDefaultLibraries>
       <ModuleDefinitionFile>
@@ -180,7 +180,6 @@
       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
-      <SDLCheck>true</SDLCheck>
       <ConformanceMode>true</ConformanceMode>
       <AdditionalIncludeDirectories>../../include</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>MI_SHARED_LIB;MI_SHARED_LIB_EXPORT;MI_MALLOC_OVERRIDE;_MBCS;%(PreprocessorDefinitions);NDEBUG</PreprocessorDefinitions>
@@ -188,14 +187,23 @@
       <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
       <WholeProgramOptimization>false</WholeProgramOptimization>
       <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
+      <EnableFiberSafeOptimizations>true</EnableFiberSafeOptimizations>
+      <ControlFlowGuard>false</ControlFlowGuard>
+      <EnableEnhancedInstructionSet>AdvancedVectorExtensions</EnableEnhancedInstructionSet>
+      <FloatingPointModel>Fast</FloatingPointModel>
+      <AdditionalOptions>/Bv /Ob3  /d2FH4  /Gw /fp:fast /GL %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Link>
       <EnableCOMDATFolding>true</EnableCOMDATFolding>
       <OptimizeReferences>true</OptimizeReferences>
       <EntryPointSymbol>DllEntry</EntryPointSymbol>
-      <AdditionalDependencies>kernel32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>kernel32.lib;..\..\bin\mimalloc-redirect.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <ModuleDefinitionFile>
       </ModuleDefinitionFile>
+      <LinkTimeCodeGeneration>UseLinkTimeCodeGeneration</LinkTimeCodeGeneration>
+      <AdditionalOptions>/LTCG /USEPROFILE:AGGRESSIVE /d2:-threads16 /d2:-notypeopt %(AdditionalOptions)</AdditionalOptions>
     </Link>
     <PostBuildEvent>
       <Command>
diff --git a/src/memory.c b/src/memory.c
index 338b1ba3..52efbace 100644
--- a/src/memory.c
+++ b/src/memory.c
@@ -389,7 +389,7 @@ void* _mi_mem_alloc_aligned(size_t size, size_t alignment, bool* commit, bool* l
   // find a range of free blocks
   void* p = NULL;
   size_t count = mi_atomic_read(&regions_count);
-  size_t idx = 0; // tld->region_idx; // start at 0 to reuse low addresses? Or, use tld->region_idx to reduce contention?
+  size_t idx = tld->region_idx; // start at 0 to reuse low addresses? Or, use tld->region_idx to reduce contention?
   for (size_t visited = 0; visited < count; visited++, idx++) {
     if (idx >= count) idx = 0;  // wrap around
     if (!mi_region_try_alloc_blocks(idx, blocks, size, commit, large, is_zero, &p, id, tld)) return NULL; // error