--- a/ntoskrnl/mm/ARM3/zeropage.c
+++ b/ntoskrnl/mm/ARM3/zeropage.c
@@ -43,6 +43,9 @@ MmZeroPageThread(VOID)
     PVOID ZeroAddress;
     PFN_NUMBER PageIndex, FreePage;
     PMMPFN Pfn1;
+    LARGE_INTEGER StartCounter, EndCounter, Frequency;
+    ULONG PageCount;
+    KFLOATING_SAVE FloatingSave;

     /* Get the discardable sections to free them */
     MiFindInitializationCode(&StartAddress, &EndAddress);
@@ -67,9 +70,15 @@ MmZeroPageThread(VOID)
                                  FALSE,
                                  NULL,
                                  NULL);
+
+        KeEnterGuardedRegion();
+        KeSaveFloatingPointState(&FloatingSave);
+
         OldIrql = KeAcquireQueuedSpinLock(LockQueuePfnLock);
         MmZeroingPageThreadActive = TRUE;

+        PageCount = 0;
+        StartCounter = KeQueryPerformanceCounter(NULL);
         while (TRUE)
         {
             if (!MmFreePageListHead.Total)
@@ -101,13 +110,36 @@ MmZeroPageThread(VOID)

             ZeroAddress = MiMapPagesInZeroSpace(Pfn1, 1);
             ASSERT(ZeroAddress);
-            RtlZeroMemory(ZeroAddress, PAGE_SIZE);
+            //RtlZeroMemory(ZeroAddress, PAGE_SIZE);
+            __asm
+            {
+                mov edi, ZeroAddress
+                mov ecx, 256
+                pxor xmm0, xmm0
+                l:
+                movntdq [edi], xmm0
+                add edi, 10h
+                dec ecx
+                jnz l
+            }
             MiUnmapPagesInZeroSpace(ZeroAddress, 1);
+            PageCount++;

             OldIrql = KeAcquireQueuedSpinLock(LockQueuePfnLock);

             MiInsertPageInList(&MmZeroedPageListHead, PageIndex);
         }
+        if (PageCount > 16)
+        {
+            EndCounter = KeQueryPerformanceCounter(&Frequency);
+            EndCounter.QuadPart -= StartCounter.QuadPart;
+            EndCounter.QuadPart *= 1000000000;
+            EndCounter.QuadPart /= Frequency.QuadPart;
+            DPRINT1("Zeroed %lu pages (%lu MB) in %I64u ns @ %I64u ns/page (total)\n", PageCount, PageCount / (1024 * 1024 / PAGE_SIZE), EndCounter.QuadPart, EndCounter.QuadPart / PageCount);
+        }
+
+        KeRestoreFloatingPointState(&FloatingSave);
+        KeLeaveGuardedRegion();
     }
 }