diff --git a/.gitmodules b/.gitmodules
index c1460fcb0..19a99e241 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -17,9 +17,6 @@
   shallow = true
 	path = External/fex-gcc-target-tests-bins
 	url = https://github.com/FEX-Emu/fex-gcc-target-tests-bins.git
-[submodule "External/jemalloc"]
-	path = External/jemalloc
-	url = https://github.com/FEX-Emu/jemalloc.git
 [submodule "External/fmt"]
 	path = External/fmt
 	url = https://github.com/fmtlib/fmt.git
@@ -52,3 +49,6 @@
 [submodule "External/unordered_dense"]
 	path = External/unordered_dense
 	url = https://github.com/martinus/unordered_dense.git
+[submodule "External/rpmalloc"]
+	path = External/rpmalloc
+	url = https://github.com/FEX-Emu/rpmalloc.git
diff --git a/CMakeLists.txt b/CMakeLists.txt
index a0e7484cb..f3480b6ee 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,7 +20,7 @@ option(ENABLE_ASSERTIONS "Enable debug assertions" FALSE)
 option(ENABLE_GDB_SYMBOLS "Enable GDBSymbols integration support" ${HAVE_GDB_JIT_READER_H})
 option(ENABLE_STRICT_WERROR "Enable stricter -Werror" FALSE)
 option(ENABLE_WERROR "Enable -Werror" FALSE)
-option(ENABLE_JEMALLOC "Enable jemalloc allocator" TRUE)
+option(ENABLE_FEX_ALLOCATOR "Enable allocator for FEX" TRUE)
 option(ENABLE_JEMALLOC_GLIBC_ALLOC "Enable jemalloc glibc allocator" TRUE)
 option(ENABLE_OFFLINE_TELEMETRY "Enable FEX offline telemetry" TRUE)
 option(ENABLE_COMPILE_TIME_TRACE "Enable time trace compile option" FALSE)
@@ -75,7 +75,7 @@ elseif (MSVC)
   message(FATAL_ERROR "FEX doesn't support MSVC! Use Clang on MinGW instead.")
 elseif (MINGW)
   message(STATUS "Building for MinGW")
-  set(ENABLE_JEMALLOC TRUE)
+  set(ENABLE_FEX_ALLOCATOR TRUE)
   set(ENABLE_JEMALLOC_GLIBC_ALLOC FALSE)
 else ()
   message(STATUS "Clang version ${CMAKE_CXX_COMPILER_VERSION}")
@@ -319,12 +319,12 @@ elseif (NOT MINGW)
     " Use at your own risk!")
 endif()
 
-if (ENABLE_JEMALLOC)
-  # The jemalloc subproject that all FEXCore fextl objects allocate through.
-  add_subdirectory(External/jemalloc/)
+if (ENABLE_FEX_ALLOCATOR)
+  # The rpmalloc subproject that all FEXCore fextl objects allocate through.
+  add_subdirectory(External/rpmalloc/)
 elseif (NOT MINGW)
-  message(STATUS
-    " jemalloc disabled!\n"
+  message (STATUS
+    " FEX allocator is disabled!\n"
     " This is not a recommended configuration!\n"
     " This will very explicitly break 32-bit application execution!\n"
     " Use at your own risk!")
diff --git a/External/jemalloc b/External/jemalloc
deleted file mode 160000
index 97d986993..000000000
--- a/External/jemalloc
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 97d986993dc735a2022856e7e9fdfa1180e8527a
diff --git a/External/rpmalloc b/External/rpmalloc
new file mode 160000
index 000000000..3c53586f9
--- /dev/null
+++ b/External/rpmalloc
@@ -0,0 +1 @@
+Subproject commit 3c53586f9c0658cc7eb4f0c2643daa0ec30f9ba3
diff --git a/FEXCore/Source/CMakeLists.txt b/FEXCore/Source/CMakeLists.txt
index e851d85df..2307973a8 100644
--- a/FEXCore/Source/CMakeLists.txt
+++ b/FEXCore/Source/CMakeLists.txt
@@ -291,9 +291,9 @@ endif()
 # Meta-library to link jemalloc libraries enabled in the build configuration.
 # Only needed for targets that run emulation. For others, use JemallocDummy.
 add_library(JemallocLibs STATIC Utils/AllocatorHooks.cpp)
-if (ENABLE_JEMALLOC)
-  target_compile_definitions(JemallocLibs PRIVATE ENABLE_JEMALLOC=1 JEMALLOC_NO_RENAME=1)
-  target_link_libraries(JemallocLibs PUBLIC FEX_jemalloc)
+if (ENABLE_FEX_ALLOCATOR)
+  target_compile_definitions(JemallocLibs PRIVATE ENABLE_FEX_ALLOCATOR=1)
+  target_link_libraries(JemallocLibs PUBLIC rpmalloc)
 endif()
 if (ENABLE_JEMALLOC_GLIBC_ALLOC)
   set_source_files_properties(Interface/HLE/Thunks/Thunks.cpp PROPERTIES COMPILE_DEFINITIONS ENABLE_JEMALLOC_GLIBC=1)
diff --git a/FEXCore/Source/Utils/Allocator.cpp b/FEXCore/Source/Utils/Allocator.cpp
index 1b5f4d317..bbf9e09c1 100644
--- a/FEXCore/Source/Utils/Allocator.cpp
+++ b/FEXCore/Source/Utils/Allocator.cpp
@@ -81,21 +81,21 @@ int FEX_munmap(void* addr, size_t length) {
 
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
-static void AssignHookOverrides() {
-  SetJemallocMmapHook(FEX_mmap);
-  SetJemallocMunmapHook(FEX_munmap);
+
+static void AssignHookOverrides(size_t PageSize) {
+  SetupAllocatorHooks(FEX_mmap, FEX_munmap);
   FEXCore::Allocator::mmap = FEX_mmap;
   FEXCore::Allocator::munmap = FEX_munmap;
+  InitializeAllocator(PageSize);
 }
 
-void SetupHooks() {
+void SetupHooks(size_t PageSize) {
   Alloc64 = Alloc::OSAllocator::Create64BitAllocator();
-  AssignHookOverrides();
+  AssignHookOverrides(PageSize);
 }
 
 void ClearHooks() {
-  SetJemallocMmapHook(::mmap);
-  SetJemallocMunmapHook(::munmap);
+  SetupAllocatorHooks(::mmap, ::munmap);
   FEXCore::Allocator::mmap = ::mmap;
   FEXCore::Allocator::munmap = ::munmap;
 
@@ -271,7 +271,7 @@ fextl::vector<MemoryRegion> StealMemoryRegion(uintptr_t Begin, uintptr_t End) {
   return Regions;
 }
 
-fextl::vector<MemoryRegion> Setup48BitAllocatorIfExists() {
+fextl::vector<MemoryRegion> Setup48BitAllocatorIfExists(size_t PageSize) {
   size_t Bits = FEXCore::Allocator::DetermineVASize();
   if (Bits < 48) {
     return {};
@@ -282,7 +282,7 @@ fextl::vector<MemoryRegion> Setup48BitAllocatorIfExists() {
   auto Regions = StealMemoryRegion(Begin48BitVA, End48BitVA);
 
   Alloc64 = Alloc::OSAllocator::Create64BitAllocatorWithRegions(Regions);
-  AssignHookOverrides();
+  AssignHookOverrides(PageSize);
 
   return Regions;
 }
diff --git a/FEXCore/Source/Utils/AllocatorHooks.cpp b/FEXCore/Source/Utils/AllocatorHooks.cpp
index cd0171b8a..87e38d51f 100644
--- a/FEXCore/Source/Utils/AllocatorHooks.cpp
+++ b/FEXCore/Source/Utils/AllocatorHooks.cpp
@@ -1,60 +1,175 @@
 // SPDX-License-Identifier: MIT
-#ifdef ENABLE_JEMALLOC
-#include <jemalloc/jemalloc.h>
+#ifdef ENABLE_FEX_ALLOCATOR
+#include <rpmalloc/rpmalloc.h>
+#ifndef _WIN32
+#include <linux/prctl.h>
+#include <sys/prctl.h>
+#include <sys/mman.h>
+#else
+#define NTDDI_VERSION 0x0A000005
+#include <memoryapi.h>
+#endif
 #endif
 
+#include <cstdint>
 #include <malloc.h>
 #include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
 #include <unistd.h>
 
 namespace FEXCore::Allocator {
-
-#ifndef _WIN32
 using mmap_hook_type = void* (*)(void* addr, size_t length, int prot, int flags, int fd, off_t offset);
 using munmap_hook_type = int (*)(void* addr, size_t length);
+
+#ifdef ENABLE_FEX_ALLOCATOR
+typedef void* (*rp_mmap_hook_type)(size_t size, size_t alignment, size_t* offset, size_t* mapped_size);
+typedef void (*rp_munmap_hook_type)(void* address, size_t offset, size_t mapped_size);
+extern "C" rp_mmap_hook_type rp_mmap_hook;
+extern "C" rp_munmap_hook_type rp_munmap_hook;
+
+#ifndef _WIN32
+mmap_hook_type fex_mmap_hook = ::mmap;
+munmap_hook_type fex_munmap_hook = ::munmap;
 #endif
 
-#ifdef ENABLE_JEMALLOC
+// Assume a 64KB page size until told otherwise.
+static rpmalloc_config_t global_config {
+  .page_size = 64 * 1024,
+  // THP causes crashes for some reason.
+  .enable_huge_pages = 0,
+  .disable_decommit = 0,
+  .page_name = "FEXAllocator",
+  .huge_page_name = "FEXAllocator",
+  .unmap_on_finalize = 0,
+};
+
 void* malloc(size_t size) {
-  return ::je_malloc(size);
+  return ::rpmalloc(size);
 }
 void* calloc(size_t n, size_t size) {
-  return ::je_calloc(n, size);
+  return ::rpcalloc(n, size);
 }
 void* memalign(size_t align, size_t s) {
-  return ::je_memalign(align, s);
+  return ::rpmemalign(align, s);
 }
 void* valloc(size_t size) {
-  return ::je_valloc(size);
+  return ::rpaligned_alloc(global_config.page_size, size);
 }
 int posix_memalign(void** r, size_t a, size_t s) {
-  return ::je_posix_memalign(r, a, s);
+  void* ptr;
+  auto res = ::rpposix_memalign(&ptr, a, s);
+  *r = ptr;
+  return res;
 }
 void* realloc(void* ptr, size_t size) {
-  return ::je_realloc(ptr, size);
+  return ::rprealloc(ptr, size);
 }
 void free(void* ptr) {
-  return ::je_free(ptr);
+  return ::rpfree(ptr);
 }
 size_t malloc_usable_size(void* ptr) {
-  return ::je_malloc_usable_size(ptr);
+  return ::rpmalloc_usable_size(ptr);
 }
 void* aligned_alloc(size_t a, size_t s) {
-  return ::je_aligned_alloc(a, s);
+  return ::rpaligned_alloc(a, s);
 }
 void aligned_free(void* ptr) {
-  return ::je_free(ptr);
+  return ::rpfree(ptr);
+}
+
+void InitializeThread() {
+  rpmalloc_thread_initialize();
 }
 
 #ifndef _WIN32
-extern "C" mmap_hook_type je___mmap_hook;
-extern "C" munmap_hook_type je___munmap_hook;
-
-void SetJemallocMmapHook(mmap_hook_type Hook) {
-  je___mmap_hook = Hook;
+[[nodiscard]]
+constexpr uint64_t AlignUp(uint64_t value, uint64_t size) {
+  return value + (size - value % size) % size;
 }
-void SetJemallocMunmapHook(munmap_hook_type Hook) {
-  je___munmap_hook = Hook;
+
+static void* FEX_rp_mmap(size_t size, size_t alignment, size_t* offset, size_t* mapped_size) {
+#define pointer_offset(ptr, ofs) (void*)((char*)(ptr) + (ptrdiff_t)(ofs))
+  // If the alignment is less than the operating page size then alignment is guaranteed. Just remove it.
+  if (alignment < global_config.page_size) {
+    alignment = 0;
+  }
+
+  size_t map_size = AlignUp(size + alignment, global_config.page_size);
+  auto ptr = fex_mmap_hook(0, map_size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+
+  if (ptr == MAP_FAILED) {
+    ptr = nullptr;
+  } else {
+#ifndef PR_SET_VMA
+#define PR_SET_VMA 0x53564d41
+#endif
+
+#ifndef PR_SET_VMA_ANON_NAME
+#define PR_SET_VMA_ANON_NAME 0
+#endif
+    prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, ptr, map_size, global_config.page_name);
+  }
+
+  if (ptr == nullptr) {
+    fprintf(stderr, "Failed to map VMA region.");
+    return nullptr;
+  }
+
+  if (alignment) {
+    size_t padding = ((uintptr_t)ptr & (uintptr_t)(alignment - 1));
+    if (padding) {
+      padding = alignment - padding;
+    }
+    ptr = pointer_offset(ptr, padding);
+    *offset = padding;
+  }
+  *mapped_size = map_size;
+  return ptr;
+}
+
+static void FEX_rp_memory_commit(void* address, size_t size) {
+  // NOP-implementation.
+}
+
+static void FEX_rp_memory_decommit(void* address, size_t size) {
+  if (global_config.disable_decommit) {
+    return;
+  }
+
+  if (madvise(address, size, MADV_DONTNEED)) {
+    fprintf(stderr, "Failed to decommit VMA region.");
+  }
+}
+
+static void FEX_rp_memory_unmap(void* address, size_t offset, size_t mapped_size) {
+  address = pointer_offset(address, -(int32_t)offset);
+  int Result = fex_munmap_hook(address, mapped_size);
+  if (Result == -1) {
+    fprintf(stderr, "Failed to unmap VMA region.");
+  }
+#undef pointer_offset
+}
+
+void SetupAllocatorHooks(mmap_hook_type MMapHook, munmap_hook_type MunmapHook) {
+  fex_mmap_hook = MMapHook;
+  fex_munmap_hook = MunmapHook;
+}
+
+static rpmalloc_interface_t global_interface {
+  .memory_map = FEX_rp_mmap,
+  .memory_commit = FEX_rp_memory_commit,
+  .memory_decommit = FEX_rp_memory_decommit,
+  .memory_unmap = FEX_rp_memory_unmap,
+  .map_fail_callback = nullptr,
+  .error_callback = nullptr,
+};
+
+void InitializeAllocator(size_t PageSize) {
+  global_config.page_size = PageSize;
+  rpmalloc_initialize_config(&global_interface, &global_config);
+  rp_mmap_hook = FEX_rp_mmap;
+  rp_munmap_hook = FEX_rp_memory_unmap;
 }
 #endif
 
@@ -62,6 +177,8 @@ void SetJemallocMunmapHook(munmap_hook_type Hook) {
 #error "Tried building _WIN32 without jemalloc"
 
 #else
+void InitializeThread() {}
+
 void* malloc(size_t size) {
   return ::malloc(size);
 }
@@ -93,8 +210,9 @@ void aligned_free(void* ptr) {
   return ::free(ptr);
 }
 
-void SetJemallocMmapHook(mmap_hook_type) {}
-void SetJemallocMunmapHook(munmap_hook_type) {}
+void SetupAllocatorHooks(mmap_hook_type MMapHook, munmap_hook_type MunmapHook) {}
+
+void InitializeAllocator(size_t PageSize) {}
 
 #endif
 } // namespace FEXCore::Allocator
diff --git a/FEXCore/include/FEXCore/Utils/Allocator.h b/FEXCore/include/FEXCore/Utils/Allocator.h
index cd4fbd1fd..1fec1b15d 100644
--- a/FEXCore/include/FEXCore/Utils/Allocator.h
+++ b/FEXCore/include/FEXCore/Utils/Allocator.h
@@ -12,7 +12,7 @@ struct InternalThreadState;
 }
 
 namespace FEXCore::Allocator {
-FEX_DEFAULT_VISIBILITY void SetupHooks();
+FEX_DEFAULT_VISIBILITY void SetupHooks(size_t PageSize);
 FEX_DEFAULT_VISIBILITY void ClearHooks();
 
 FEX_DEFAULT_VISIBILITY size_t DetermineVASize();
@@ -77,7 +77,7 @@ FEX_DEFAULT_VISIBILITY void ReclaimMemoryRegion(const fextl::vector<MemoryRegion
 // AArch64 canonical addresses are only up to bits 48/52 with the remainder being other things
 // Use this to reserve the top 128TB of VA so the guest never see it
 // Returns nullptr on host VA < 48bits
-FEX_DEFAULT_VISIBILITY fextl::vector<MemoryRegion> Setup48BitAllocatorIfExists();
+FEX_DEFAULT_VISIBILITY fextl::vector<MemoryRegion> Setup48BitAllocatorIfExists(size_t PageSize);
 
 #ifndef _WIN32
 FEX_DEFAULT_VISIBILITY void RegisterTLSData(FEXCore::Core::InternalThreadState* Thread);
diff --git a/FEXCore/include/FEXCore/Utils/AllocatorHooks.h b/FEXCore/include/FEXCore/Utils/AllocatorHooks.h
index 718287b53..7188a872a 100644
--- a/FEXCore/include/FEXCore/Utils/AllocatorHooks.h
+++ b/FEXCore/include/FEXCore/Utils/AllocatorHooks.h
@@ -139,9 +139,11 @@ size_t malloc_usable_size(void* ptr);
 void* aligned_alloc(size_t a, size_t s);
 void aligned_free(void* ptr);
 
+FEX_DEFAULT_VISIBILITY extern void InitializeThread();
+
 #ifndef _WIN32
-void SetJemallocMmapHook(void* (*)(void* addr, size_t length, int prot, int flags, int fd, off_t offset));
-void SetJemallocMunmapHook(int (*)(void* addr, size_t length));
+void InitializeAllocator(size_t PageSize);
+void SetupAllocatorHooks(void* (*)(void* addr, size_t length, int prot, int flags, int fd, off_t offset), int (*)(void* addr, size_t length));
 #endif
 
 struct FEXAllocOperators {
diff --git a/Source/Tools/FEXInterpreter/FEXInterpreter.cpp b/Source/Tools/FEXInterpreter/FEXInterpreter.cpp
index 71bd91575..f5113c8c4 100644
--- a/Source/Tools/FEXInterpreter/FEXInterpreter.cpp
+++ b/Source/Tools/FEXInterpreter/FEXInterpreter.cpp
@@ -145,9 +145,10 @@ void Init() {
 namespace FEX::Allocator {
 
 fextl::vector<FEXCore::Allocator::MemoryRegion> InitMemoryRegions(bool Is64Bit) {
+  const auto PageSize = sysconf(_SC_PAGESIZE);
   if (Is64Bit) {
     // Destroy the 48th bit if it exists
-    return FEXCore::Allocator::Setup48BitAllocatorIfExists();
+    return FEXCore::Allocator::Setup48BitAllocatorIfExists(PageSize > 0 ? PageSize : FEXCore::Utils::FEX_PAGE_SIZE);
   }
 
   // Reserve [0x1_0000_0000, 0x2_0000_0000).
@@ -161,8 +162,10 @@ fextl::unique_ptr<FEX::HLE::MemAllocator> InitAllocator(bool Is64Bit) {
     return {};
   }
 
+  const auto PageSize = sysconf(_SC_PAGESIZE);
+
   // Setup our userspace allocator
-  FEXCore::Allocator::SetupHooks();
+  FEXCore::Allocator::SetupHooks(PageSize > 0 ? PageSize : FEXCore::Utils::FEX_PAGE_SIZE);
   auto Allocator = FEX::HLE::CreatePassthroughAllocator();
 
   // Now that the upper 32-bit address space is blocked for future allocations,
diff --git a/Source/Tools/FEXOfflineCompiler/Main.cpp b/Source/Tools/FEXOfflineCompiler/Main.cpp
index 1f1a66aa1..da2f68e11 100644
--- a/Source/Tools/FEXOfflineCompiler/Main.cpp
+++ b/Source/Tools/FEXOfflineCompiler/Main.cpp
@@ -154,8 +154,9 @@ GenerateSingleCache(const FEXCore::ExecutableFileInfo& Binary, fextl::set<uintpt
   }
 
   if (!Is64Bit) {
+    const auto PageSize = sysconf(_SC_PAGESIZE);
     // Block upper address space
-    FEXCore::Allocator::SetupHooks();
+    FEXCore::Allocator::SetupHooks(PageSize > 0 ? PageSize : FEXCore::Utils::FEX_PAGE_SIZE);
   }
 
   auto Thread = SetupCompileThread(*CTX, Is64Bit);
diff --git a/Source/Tools/LinuxEmulation/LinuxSyscalls/Syscalls/Thread.cpp b/Source/Tools/LinuxEmulation/LinuxSyscalls/Syscalls/Thread.cpp
index 47e1d0c97..aa13b9cd9 100644
--- a/Source/Tools/LinuxEmulation/LinuxSyscalls/Syscalls/Thread.cpp
+++ b/Source/Tools/LinuxEmulation/LinuxSyscalls/Syscalls/Thread.cpp
@@ -68,6 +68,8 @@ static void* ThreadHandler(void* Data) {
     Thread->Thread->ThreadStats->TID.store(Thread->ThreadInfo.TID, std::memory_order_relaxed);
   }
 
+  FEXCore::Allocator::InitializeThread();
+
   FEX::HLE::_SyscallHandler->RegisterTLSState(Thread);
 
   // Now notify the thread that we are initialized
@@ -176,6 +178,7 @@ FEX::HLE::ThreadStateObject* CreateNewThread(FEXCore::Context::Context* CTX, FEX
 
 uint64_t HandleNewClone(FEX::HLE::ThreadStateObject* Thread, FEXCore::Context::Context* CTX, FEXCore::Core::CpuStateFrame* Frame,
                         FEX::HLE::clone3_args* CloneArgs) {
+  FEXCore::Allocator::InitializeThread();
   auto GuestArgs = &CloneArgs->args;
   uint64_t flags = GuestArgs->flags;
   auto NewThread = Thread;
diff --git a/Source/Tools/TestHarnessRunner/TestHarnessRunner.cpp b/Source/Tools/TestHarnessRunner/TestHarnessRunner.cpp
index b8426fe9f..4a0f85115 100644
--- a/Source/Tools/TestHarnessRunner/TestHarnessRunner.cpp
+++ b/Source/Tools/TestHarnessRunner/TestHarnessRunner.cpp
@@ -236,7 +236,8 @@ int main(int argc, char** argv, char** const envp) {
 
   if (!Loader.Is64BitMode()) {
     // Setup our userspace allocator
-    FEXCore::Allocator::SetupHooks();
+    const auto PageSize = sysconf(_SC_PAGESIZE);
+    FEXCore::Allocator::SetupHooks(PageSize > 0 ? PageSize : FEXCore::Utils::FEX_PAGE_SIZE);
     Allocator = FEX::HLE::CreatePassthroughAllocator();
   }
 #endif
diff --git a/Source/Windows/ARM64EC/Module.cpp b/Source/Windows/ARM64EC/Module.cpp
index 49d3f1bce..2384efaff 100644
--- a/Source/Windows/ARM64EC/Module.cpp
+++ b/Source/Windows/ARM64EC/Module.cpp
@@ -1027,6 +1027,7 @@ NTSTATUS ThreadTerm(HANDLE Thread, LONG ExitCode) {
   if (ThreadTID == GetCurrentThreadId()) {
     FEX::Windows::DeinitCRTThread();
   }
+
   return STATUS_SUCCESS;
 }
 
diff --git a/Source/Windows/Common/CRT/Alloc.cpp b/Source/Windows/Common/CRT/Alloc.cpp
index 3900537a8..3d5f60de8 100644
--- a/Source/Windows/Common/CRT/Alloc.cpp
+++ b/Source/Windows/Common/CRT/Alloc.cpp
@@ -3,42 +3,28 @@
 #define _CRTIMP
 #include <cstdint>
 #include "../Priv.h"
-
-extern "C" {
-
-#define JEMALLOC_NOTHROW __attribute__((nothrow))
-JEMALLOC_NOTHROW extern void* je_malloc(size_t size);
-JEMALLOC_NOTHROW extern void* je_calloc(size_t n, size_t size);
-JEMALLOC_NOTHROW extern void* je_memalign(size_t align, size_t s);
-JEMALLOC_NOTHROW extern void* je_valloc(size_t size);
-JEMALLOC_NOTHROW extern int je_posix_memalign(void** r, size_t a, size_t s);
-JEMALLOC_NOTHROW extern void* je_realloc(void* ptr, size_t size);
-JEMALLOC_NOTHROW extern void je_free(void* ptr);
-JEMALLOC_NOTHROW extern size_t je_malloc_usable_size(void* ptr);
-JEMALLOC_NOTHROW extern void* je_aligned_alloc(size_t a, size_t s);
-#undef JEMALLOC_NOTHROW
-}
+#include <rpmalloc/rpmalloc.h>
 
 void* calloc(size_t NumOfElements, size_t SizeOfElements) {
-  return je_calloc(NumOfElements, SizeOfElements);
+  return ::rpcalloc(NumOfElements, SizeOfElements);
 }
 
 void free(void* Memory) {
-  je_free(Memory);
+  ::rpfree(Memory);
 }
 
 void* malloc(size_t Size) {
-  return je_malloc(Size);
+  return ::rpmalloc(Size);
 }
 
 void* realloc(void* Memory, size_t NewSize) {
-  return je_realloc(Memory, NewSize);
+  return ::rprealloc(Memory, NewSize);
 }
 
 DLLEXPORT_FUNC(void*, _aligned_malloc, (size_t Size, size_t Alignment)) {
-  return je_aligned_alloc(Alignment, Size);
+  return ::rpaligned_alloc(Alignment, Size);
 }
 
 DLLEXPORT_FUNC(void, _aligned_free, (void* Memory)) {
-  je_free(Memory);
+  ::rpfree(Memory);
 }
diff --git a/Source/Windows/Common/CRT/CRT.cpp b/Source/Windows/Common/CRT/CRT.cpp
index bf87f1b0f..addea79d8 100644
--- a/Source/Windows/Common/CRT/CRT.cpp
+++ b/Source/Windows/Common/CRT/CRT.cpp
@@ -3,6 +3,7 @@
 #include <windef.h>
 #include <winternl.h>
 #include <wine/debug.h>
+#include <rpmalloc/rpmalloc.h>
 #include "CRT.h"
 
 extern "C" {
@@ -39,6 +40,8 @@ void RunFuncArray(TFuncIt Begin, TFuncIt End, TArgs... Args) {
 
 namespace FEX::Windows {
 void InitCRTProcess() {
+  rpmalloc_initialize(nullptr);
+
   auto GNUCtorBegin = &__CTOR_LIST__[1];
   auto GNUCtorEnd = GNUCtorBegin;
   while (*GNUCtorEnd != nullptr) {
@@ -53,10 +56,12 @@ void InitCRTProcess() {
 }
 
 void InitCRTThread() {
+  rpmalloc_thread_initialize();
   RunFuncArray(&XLA, &XLZ, nullptr, DLL_THREAD_ATTACH, nullptr);
 }
 
 void DeinitCRTThread() {
   RunFuncArray(&XLA, &XLZ, nullptr, DLL_THREAD_DETACH, nullptr);
+  rpmalloc_thread_finalize();
 }
 } // namespace FEX::Windows
diff --git a/docs/jemalloc_usage.md b/docs/allocator_usage.md
similarity index 90%
rename from docs/jemalloc_usage.md
rename to docs/allocator_usage.md
index ab27c1345..41aa60380 100644
--- a/docs/jemalloc_usage.md
+++ b/docs/allocator_usage.md
@@ -1,9 +1,9 @@
-# JEMalloc usage
-FEX-Emu uses two different jemalloc heap allocators at once, each for different purposes:
-- jemalloc: The primary heap allocator (to keep FEX's internal allocations out of the 32-bit address space used by guest applications)
+# Dual allocator usage
+FEX-Emu uses two different heap allocators at once, each for different purposes:
+- rpmalloc: The primary heap allocator (to keep FEX's internal allocations out of the 32-bit address space used by guest applications)
 - jemalloc_glibc: The second heap allocator (to add allocation introspection features used by thunks)
 
-## jemalloc - primary heap allocator
+## rpmalloc - primary heap allocator
 This allocator overrides `mmap` and `munmap` by forwarding them to FEXCore's internal VMA region allocator.
 
 All of FEXCore's `fextl::` namespaced objects allocate memory with this method.