diff --git a/include/functions.h b/include/functions.h
index dad884450d..d2baeb8ae7 100644
--- a/include/functions.h
+++ b/include/functions.h
@@ -1786,45 +1786,23 @@ void Rand_Seed_Variable(u32* rndNum, u32 seed);
 u32 Rand_Next_Variable(u32* rndNum);
 f32 Rand_ZeroOne_Variable(u32* rndNum);
 f32 Rand_Centered_Variable(u32* rndNum);
-u32 ArenaImpl_GetFillAllocBlock(Arena* arena);
-u32 ArenaImpl_GetFillFreeBlock(Arena* arena);
-u32 ArenaImpl_GetCheckFreeBlock(Arena* arena);
-void ArenaImpl_SetFillAllocBlock(Arena* arena);
-void ArenaImpl_SetFillFreeBlock(Arena* arena);
-void ArenaImpl_SetCheckFreeBlock(Arena* arena);
-void ArenaImpl_UnsetFillAllocBlock(Arena* arena);
-void ArenaImpl_UnsetFillFreeBlock(Arena* arena);
-void ArenaImpl_UnsetCheckFreeBlock(Arena* arena);
-void ArenaImpl_SetDebugInfo(ArenaNode* node, const char* file, s32 line, Arena* arena);
-void ArenaImpl_LockInit(Arena* arena);
-void ArenaImpl_Lock(Arena* arena);
-void ArenaImpl_Unlock(Arena* arena);
-ArenaNode* ArenaImpl_GetNextBlock(ArenaNode* node);
-ArenaNode* ArenaImpl_GetPrevBlock(ArenaNode* node);
-ArenaNode* ArenaImpl_GetLastBlock(Arena* arena);
 void __osMallocInit(Arena* arena, void* start, u32 size);
 void __osMallocAddBlock(Arena* arena, void* start, s32 size);
-void ArenaImpl_RemoveAllBlocks(Arena* arena);
 void __osMallocCleanup(Arena* arena);
 u8 __osMallocIsInitialized(Arena* arena);
-void __osMalloc_FreeBlockTest(Arena* arena, ArenaNode* node);
-void* __osMalloc_NoLockDebug(Arena* arena, u32 size, const char* file, s32 line);
-void* __osMallocDebug(Arena* arena, u32 size, const char* file, s32 line);
-void* __osMallocRDebug(Arena* arena, u32 size, const char* file, s32 line);
-void* __osMalloc_NoLock(Arena* arena, u32 size);
 void* __osMalloc(Arena* arena, u32 size);
 void* __osMallocR(Arena* arena, u32 size);
-void __osFree_NoLock(Arena* arena, void* ptr);
 void __osFree(Arena* arena, void* ptr);
-void __osFree_NoLockDebug(Arena* arena, void* ptr, const char* file, s32 line);
-void __osFreeDebug(Arena* arena, void* ptr, const char* file, s32 line);
 void* __osRealloc(Arena* arena, void* ptr, u32 newSize);
-void* __osReallocDebug(Arena* arena, void* ptr, u32 newSize, const char* file, s32 line);
 void ArenaImpl_GetSizes(Arena* arena, u32* outMaxFree, u32* outFree, u32* outAlloc);
-void __osDisplayArena(Arena* arena);
-void ArenaImpl_FaultClient(Arena* arena);
 u32 __osCheckArena(Arena* arena);
-u8 func_800FF334(Arena* arena);
+#if OOT_DEBUG
+void* __osMallocDebug(Arena* arena, u32 size, const char* file, s32 line);
+void* __osMallocRDebug(Arena* arena, u32 size, const char* file, s32 line);
+void __osFreeDebug(Arena* arena, void* ptr, const char* file, s32 line);
+void* __osReallocDebug(Arena* arena, void* ptr, u32 newSize, const char* file, s32 line);
+void __osDisplayArena(Arena* arena);
+#endif
 s32 PrintUtils_VPrintf(PrintCallback* pfn, const char* fmt, va_list args);
 s32 PrintUtils_Printf(PrintCallback* pfn, const char* fmt, ...);
 void Sleep_Cycles(OSTime cycles);
diff --git a/include/z64.h b/include/z64.h
index 0d8b37d843..92ce7fb686 100644
--- a/include/z64.h
+++ b/include/z64.h
@@ -704,7 +704,7 @@ typedef struct Arena {
     /* 0x00 */ struct ArenaNode* head;
     /* 0x04 */ void* start;
     /* 0x08 */ OSMesgQueue lockQueue;
-    /* 0x20 */ u8 unk_20;
+    /* 0x20 */ u8 allocFailures; // only used in non-debug builds
     /* 0x21 */ u8 isInit;
     /* 0x22 */ u8 flag;
 } Arena; // size = 0x24
@@ -715,12 +715,14 @@ typedef struct ArenaNode {
     /* 0x04 */ u32 size;
     /* 0x08 */ struct ArenaNode* next;
     /* 0x0C */ struct ArenaNode* prev;
+#if OOT_DEBUG // TODO: This debug info is also present in N64 retail builds
     /* 0x10 */ const char* filename;
     /* 0x14 */ s32 line;
     /* 0x18 */ OSId threadId;
     /* 0x1C */ Arena* arena;
     /* 0x20 */ OSTime time;
     /* 0x28 */ u8 unk_28[0x30-0x28]; // probably padding
+#endif
 } ArenaNode; // size = 0x30
 
 /* Relocation entry field getters */
diff --git a/src/code/__osMalloc.c b/src/code/__osMalloc.c
index 6a12b5a5a8..6119f8af07 100644
--- a/src/code/__osMalloc.c
+++ b/src/code/__osMalloc.c
@@ -1,9 +1,9 @@
 #include "global.h"
 #include "terminal.h"
 
-#define FILL_ALLOCBLOCK (1 << 0)
-#define FILL_FREEBLOCK (1 << 1)
-#define CHECK_FREE_BLOCK (1 << 2)
+#define FILL_ALLOC_BLOCK_FLAG (1 << 0)
+#define FILL_FREE_BLOCK_FLAG (1 << 1)
+#define CHECK_FREE_BLOCK_FLAG (1 << 2)
 
 #define NODE_MAGIC (0x7373)
 
@@ -14,37 +14,90 @@
 #define BLOCK_FREE_MAGIC (0xEF)
 #define BLOCK_FREE_MAGIC_32 (0xEFEFEFEF)
 
+#define NODE_IS_VALID(node) (((node) != NULL) && ((node)->magic == NODE_MAGIC))
+
+#if OOT_DEBUG
+
+#define NODE_GET_NEXT(node) ArenaImpl_GetNextBlock(node)
+#define NODE_GET_PREV(node) ArenaImpl_GetPrevBlock(node)
+
+#define SET_DEBUG_INFO(node, file, line, arena) ArenaImpl_SetDebugInfo(node, file, line, arena)
+
+#define FILL_ALLOC_BLOCK(arena, alloc, size)   \
+    if ((arena)->flag & FILL_ALLOC_BLOCK_FLAG) \
+    __osMemset(alloc, BLOCK_ALLOC_MAGIC, size)
+
+#define FILL_FREE_BLOCK_HEADER(arena, node)   \
+    if ((arena)->flag & FILL_FREE_BLOCK_FLAG) \
+    __osMemset(node, BLOCK_FREE_MAGIC, sizeof(ArenaNode))
+
+#define FILL_FREE_BLOCK_CONTENTS(arena, node) \
+    if ((arena)->flag & FILL_FREE_BLOCK_FLAG) \
+    __osMemset((void*)((u32)(node) + sizeof(ArenaNode)), BLOCK_FREE_MAGIC, (node)->size)
+
+#define CHECK_FREE_BLOCK(arena, node)          \
+    if ((arena)->flag & CHECK_FREE_BLOCK_FLAG) \
+    __osMalloc_FreeBlockTest(arena, node)
+
+#define CHECK_ALLOC_FAILURE(arena, ptr) (void)0
+
+#else
+
+#define NODE_GET_NEXT(node) (NODE_IS_VALID((node)->next) ? (node)->next : NULL)
+#define NODE_GET_PREV(node) (NODE_IS_VALID((node)->prev) ? (node)->prev : NULL)
+
+#define SET_DEBUG_INFO(node, file, line, arena) (void)0
+#define FILL_ALLOC_BLOCK(arena, alloc, size) (void)0
+#define FILL_FREE_BLOCK_HEADER(arena, node) (void)0
+#define FILL_FREE_BLOCK_CONTENTS(arena, node) (void)0
+#define CHECK_FREE_BLOCK(arena, node) (void)0
+
+// Number of allocation failures across all arenas.
+u32 sTotalAllocFailures = 0;
+
+#define CHECK_ALLOC_FAILURE(arena, ptr) \
+    do {                                \
+        if ((ptr) == NULL) {            \
+            sTotalAllocFailures++;      \
+            (arena)->allocFailures++;   \
+        }                               \
+    } while (0)
+
+#endif
+
 OSMesg sArenaLockMsg;
+
+#if OOT_DEBUG
 u32 __osMalloc_FreeBlockTest_Enable;
 
 u32 ArenaImpl_GetFillAllocBlock(Arena* arena) {
-    return (arena->flag & FILL_ALLOCBLOCK) != 0;
+    return (arena->flag & FILL_ALLOC_BLOCK_FLAG) != 0;
 }
 u32 ArenaImpl_GetFillFreeBlock(Arena* arena) {
-    return (arena->flag & FILL_FREEBLOCK) != 0;
+    return (arena->flag & FILL_FREE_BLOCK_FLAG) != 0;
 }
 u32 ArenaImpl_GetCheckFreeBlock(Arena* arena) {
-    return (arena->flag & CHECK_FREE_BLOCK) != 0;
+    return (arena->flag & CHECK_FREE_BLOCK_FLAG) != 0;
 }
 
 void ArenaImpl_SetFillAllocBlock(Arena* arena) {
-    arena->flag |= FILL_ALLOCBLOCK;
+    arena->flag |= FILL_ALLOC_BLOCK_FLAG;
 }
 void ArenaImpl_SetFillFreeBlock(Arena* arena) {
-    arena->flag |= FILL_FREEBLOCK;
+    arena->flag |= FILL_FREE_BLOCK_FLAG;
 }
 void ArenaImpl_SetCheckFreeBlock(Arena* arena) {
-    arena->flag |= CHECK_FREE_BLOCK;
+    arena->flag |= CHECK_FREE_BLOCK_FLAG;
 }
 
 void ArenaImpl_UnsetFillAllocBlock(Arena* arena) {
-    arena->flag &= ~FILL_ALLOCBLOCK;
+    arena->flag &= ~FILL_ALLOC_BLOCK_FLAG;
 }
 void ArenaImpl_UnsetFillFreeBlock(Arena* arena) {
-    arena->flag &= ~FILL_FREEBLOCK;
+    arena->flag &= ~FILL_FREE_BLOCK_FLAG;
 }
 void ArenaImpl_UnsetCheckFreeBlock(Arena* arena) {
-    arena->flag &= ~CHECK_FREE_BLOCK;
+    arena->flag &= ~CHECK_FREE_BLOCK_FLAG;
 }
 
 void ArenaImpl_SetDebugInfo(ArenaNode* node, const char* file, s32 line, Arena* arena) {
@@ -54,6 +107,7 @@ void ArenaImpl_SetDebugInfo(ArenaNode* node, const char* file, s32 line, Arena*
     node->arena = arena;
     node->time = osGetTime();
 }
+#endif
 
 void ArenaImpl_LockInit(Arena* arena) {
     osCreateMesgQueue(&arena->lockQueue, &sArenaLockMsg, 1);
@@ -67,6 +121,7 @@ void ArenaImpl_Unlock(Arena* arena) {
     osRecvMesg(&arena->lockQueue, NULL, OS_MESG_BLOCK);
 }
 
+#if OOT_DEBUG
 ArenaNode* ArenaImpl_GetNextBlock(ArenaNode* node) {
     ArenaNode* next = node->next;
 
@@ -88,16 +143,17 @@ ArenaNode* ArenaImpl_GetPrevBlock(ArenaNode* node) {
     }
     return prev;
 }
+#endif
 
 ArenaNode* ArenaImpl_GetLastBlock(Arena* arena) {
     ArenaNode* last = NULL;
     ArenaNode* iter;
 
-    if (arena != NULL && arena->head != NULL && arena->head->magic == NODE_MAGIC) {
+    if (arena != NULL && NODE_IS_VALID(arena->head)) {
         iter = arena->head;
         while (iter != NULL) {
             last = iter;
-            iter = ArenaImpl_GetNextBlock(iter);
+            iter = NODE_GET_NEXT(last);
         }
     }
     return last;
@@ -122,7 +178,9 @@ void __osMallocAddBlock(Arena* arena, void* start, s32 size) {
         size2 = (size - diff) & ~0xF;
 
         if (size2 > (s32)sizeof(ArenaNode)) {
+#if OOT_DEBUG
             __osMemset(firstNode, BLOCK_UNINIT_MAGIC, size2);
+#endif
             firstNode->next = NULL;
             firstNode->prev = NULL;
             firstNode->size = size2 - sizeof(ArenaNode);
@@ -142,6 +200,7 @@ void __osMallocAddBlock(Arena* arena, void* start, s32 size) {
     }
 }
 
+#if OOT_DEBUG
 void ArenaImpl_RemoveAllBlocks(Arena* arena) {
     ArenaNode* iter;
     ArenaNode* next;
@@ -150,16 +209,19 @@ void ArenaImpl_RemoveAllBlocks(Arena* arena) {
 
     iter = arena->head;
     while (iter != NULL) {
-        next = ArenaImpl_GetNextBlock(iter);
+        next = NODE_GET_NEXT(iter);
         __osMemset(iter, BLOCK_UNINIT_MAGIC, iter->size + sizeof(ArenaNode));
         iter = next;
     }
 
     ArenaImpl_Unlock(arena);
 }
+#endif
 
 void __osMallocCleanup(Arena* arena) {
+#if OOT_DEBUG
     ArenaImpl_RemoveAllBlocks(arena);
+#endif
     bzero(arena, sizeof(*arena));
 }
 
@@ -167,6 +229,7 @@ u8 __osMallocIsInitialized(Arena* arena) {
     return arena->isInit;
 }
 
+#if OOT_DEBUG
 void __osMalloc_FreeBlockTest(Arena* arena, ArenaNode* node) {
     ArenaNode* node2 = node;
     u32* start;
@@ -204,13 +267,11 @@ void* __osMalloc_NoLockDebug(Arena* arena, u32 size, const char* file, s32 line)
 
     while (iter != NULL) {
         if (iter->isFree && iter->size >= size) {
-            if (arena->flag & CHECK_FREE_BLOCK) {
-                __osMalloc_FreeBlockTest(arena, iter);
-            }
+            CHECK_FREE_BLOCK(arena, iter);
 
             if (blockSize < iter->size) {
                 newNode = (ArenaNode*)((u32)iter + blockSize);
-                newNode->next = ArenaImpl_GetNextBlock(iter);
+                newNode->next = NODE_GET_NEXT(iter);
                 newNode->prev = iter;
                 newNode->size = iter->size - blockSize;
                 newNode->isFree = true;
@@ -218,23 +279,21 @@ void* __osMalloc_NoLockDebug(Arena* arena, u32 size, const char* file, s32 line)
 
                 iter->next = newNode;
                 iter->size = size;
-                next = ArenaImpl_GetNextBlock(newNode);
+                next = NODE_GET_NEXT(newNode);
                 if (next) {
                     next->prev = newNode;
                 }
             }
 
             iter->isFree = false;
-            ArenaImpl_SetDebugInfo(iter, file, line, arena);
+            SET_DEBUG_INFO(iter, file, line, arena);
             alloc = (void*)((u32)iter + sizeof(ArenaNode));
-            if (arena->flag & FILL_ALLOCBLOCK) {
-                __osMemset(alloc, BLOCK_ALLOC_MAGIC, size);
-            }
+            FILL_ALLOC_BLOCK(arena, alloc, size);
 
             break;
         }
 
-        iter = ArenaImpl_GetNextBlock(iter);
+        iter = NODE_GET_NEXT(iter);
     }
 
     return alloc;
@@ -263,21 +322,19 @@ void* __osMallocRDebug(Arena* arena, u32 size, const char* file, s32 line) {
 
     while (iter != NULL) {
         if (iter->isFree && iter->size >= size) {
-            if (arena->flag & CHECK_FREE_BLOCK) {
-                __osMalloc_FreeBlockTest(arena, iter);
-            }
+            CHECK_FREE_BLOCK(arena, iter);
 
             blockSize = ALIGN16(size) + sizeof(ArenaNode);
             if (blockSize < iter->size) {
                 newNode = (ArenaNode*)((u32)iter + (iter->size - size));
-                newNode->next = ArenaImpl_GetNextBlock(iter);
+                newNode->next = NODE_GET_NEXT(iter);
                 newNode->prev = iter;
                 newNode->size = size;
                 newNode->magic = NODE_MAGIC;
 
                 iter->next = newNode;
                 iter->size -= blockSize;
-                next = ArenaImpl_GetNextBlock(newNode);
+                next = NODE_GET_NEXT(newNode);
                 if (next) {
                     next->prev = newNode;
                 }
@@ -285,21 +342,20 @@ void* __osMallocRDebug(Arena* arena, u32 size, const char* file, s32 line) {
             }
 
             iter->isFree = false;
-            ArenaImpl_SetDebugInfo(iter, file, line, arena);
+            SET_DEBUG_INFO(iter, file, line, arena);
             allocR = (void*)((u32)iter + sizeof(ArenaNode));
-            if (arena->flag & FILL_ALLOCBLOCK) {
-                __osMemset(allocR, BLOCK_ALLOC_MAGIC, size);
-            }
+            FILL_ALLOC_BLOCK(arena, allocR, size);
 
             break;
         }
 
-        iter = ArenaImpl_GetPrevBlock(iter);
+        iter = NODE_GET_PREV(iter);
     }
     ArenaImpl_Unlock(arena);
 
     return allocR;
 }
+#endif
 
 void* __osMalloc_NoLock(Arena* arena, u32 size) {
     ArenaNode* iter;
@@ -308,20 +364,17 @@ void* __osMalloc_NoLock(Arena* arena, u32 size) {
     void* alloc = NULL;
     ArenaNode* next;
 
-    iter = arena->head;
     size = ALIGN16(size);
     blockSize = ALIGN16(size) + sizeof(ArenaNode);
+    iter = arena->head;
 
     while (iter != NULL) {
 
         if (iter->isFree && iter->size >= size) {
-            if (arena->flag & CHECK_FREE_BLOCK) {
-                __osMalloc_FreeBlockTest(arena, iter);
-            }
-
+            CHECK_FREE_BLOCK(arena, iter);
             if (blockSize < iter->size) {
                 newNode = (ArenaNode*)((u32)iter + blockSize);
-                newNode->next = ArenaImpl_GetNextBlock(iter);
+                newNode->next = NODE_GET_NEXT(iter);
                 newNode->prev = iter;
                 newNode->size = iter->size - blockSize;
                 newNode->isFree = true;
@@ -329,24 +382,24 @@ void* __osMalloc_NoLock(Arena* arena, u32 size) {
 
                 iter->next = newNode;
                 iter->size = size;
-                next = ArenaImpl_GetNextBlock(newNode);
+                next = NODE_GET_NEXT(newNode);
                 if (next) {
                     next->prev = newNode;
                 }
             }
 
             iter->isFree = false;
-            ArenaImpl_SetDebugInfo(iter, NULL, 0, arena);
+            SET_DEBUG_INFO(iter, NULL, 0, arena);
             alloc = (void*)((u32)iter + sizeof(ArenaNode));
-            if (arena->flag & FILL_ALLOCBLOCK) {
-                __osMemset(alloc, BLOCK_ALLOC_MAGIC, size);
-            }
+            FILL_ALLOC_BLOCK(arena, alloc, size);
             break;
         }
 
-        iter = ArenaImpl_GetNextBlock(iter);
+        iter = NODE_GET_NEXT(iter);
     }
 
+    CHECK_ALLOC_FAILURE(arena, alloc);
+
     return alloc;
 }
 
@@ -362,32 +415,33 @@ void* __osMalloc(Arena* arena, u32 size) {
 
 void* __osMallocR(Arena* arena, u32 size) {
     ArenaNode* iter;
+    ArenaNode* allocNode;
     ArenaNode* newNode;
-    u32 blockSize;
     ArenaNode* next;
     void* alloc = NULL;
+    u32 blockSize;
 
     size = ALIGN16(size);
+    blockSize = ALIGN16(size) + sizeof(ArenaNode);
     ArenaImpl_Lock(arena);
     iter = ArenaImpl_GetLastBlock(arena);
 
     while (iter != NULL) {
         if (iter->isFree && iter->size >= size) {
-            if (arena->flag & CHECK_FREE_BLOCK) {
-                __osMalloc_FreeBlockTest(arena, iter);
-            }
+            CHECK_FREE_BLOCK(arena, iter);
 
-            blockSize = ALIGN16(size) + sizeof(ArenaNode);
             if (blockSize < iter->size) {
-                newNode = (ArenaNode*)((u32)iter + (iter->size - size));
-                newNode->next = ArenaImpl_GetNextBlock(iter);
+                allocNode = (ArenaNode*)((u32)iter + (iter->size - size));
+                allocNode->next = NODE_GET_NEXT(iter);
+
+                newNode = allocNode;
                 newNode->prev = iter;
                 newNode->size = size;
                 newNode->magic = NODE_MAGIC;
 
                 iter->next = newNode;
                 iter->size -= blockSize;
-                next = ArenaImpl_GetNextBlock(newNode);
+                next = NODE_GET_NEXT(newNode);
                 if (next) {
                     next->prev = newNode;
                 }
@@ -395,15 +449,16 @@ void* __osMallocR(Arena* arena, u32 size) {
             }
 
             iter->isFree = false;
-            ArenaImpl_SetDebugInfo(iter, NULL, 0, arena);
+            SET_DEBUG_INFO(iter, NULL, 0, arena);
             alloc = (void*)((u32)iter + sizeof(ArenaNode));
-            if (arena->flag & FILL_ALLOCBLOCK) {
-                __osMemset(alloc, BLOCK_ALLOC_MAGIC, size);
-            }
+            FILL_ALLOC_BLOCK(arena, alloc, size);
             break;
         }
-        iter = ArenaImpl_GetPrevBlock(iter);
+        iter = NODE_GET_PREV(iter);
     }
+
+    CHECK_ALLOC_FAILURE(arena, alloc);
+
     ArenaImpl_Unlock(arena);
 
     return alloc;
@@ -413,7 +468,6 @@ void __osFree_NoLock(Arena* arena, void* ptr) {
     ArenaNode* node;
     ArenaNode* next;
     ArenaNode* prev;
-    ArenaNode* newNext;
 
     if (ptr == NULL) {
         return;
@@ -422,40 +476,37 @@ void __osFree_NoLock(Arena* arena, void* ptr) {
     node = (ArenaNode*)((u32)ptr - sizeof(ArenaNode));
     if (node == NULL || node->magic != NODE_MAGIC) {
         // "__osFree: Unauthorized release (%08x)"
-        osSyncPrintf(VT_COL(RED, WHITE) "__osFree:不正解放(%08x)\n" VT_RST, ptr);
+        PRINTF(VT_COL(RED, WHITE) "__osFree:不正解放(%08x)\n" VT_RST, ptr);
         return;
     }
     if (node->isFree) {
-        osSyncPrintf(VT_COL(RED, WHITE) "__osFree:二重解放(%08x)\n" VT_RST, ptr); // "__osFree: Double release (%08x)"
+        PRINTF(VT_COL(RED, WHITE) "__osFree:二重解放(%08x)\n" VT_RST, ptr); // "__osFree: Double release (%08x)"
         return;
     }
+#if OOT_DEBUG
     if (arena != node->arena && arena != NULL) {
         // "__osFree:Tried to release in a different way than when it was secured (%08x:%08x)"
-        osSyncPrintf(VT_COL(RED, WHITE) "__osFree:確保時と違う方法で解放しようとした (%08x:%08x)\n" VT_RST, arena,
-                     node->arena);
+        PRINTF(VT_COL(RED, WHITE) "__osFree:確保時と違う方法で解放しようとした (%08x:%08x)\n" VT_RST, arena,
+               node->arena);
         return;
     }
+#endif
 
-    next = ArenaImpl_GetNextBlock(node);
-    prev = ArenaImpl_GetPrevBlock(node);
+    next = NODE_GET_NEXT(node);
+    prev = NODE_GET_PREV(node);
     node->isFree = true;
-    ArenaImpl_SetDebugInfo(node, NULL, 0, arena);
+    SET_DEBUG_INFO(node, NULL, 0, arena);
 
-    if (arena->flag & FILL_FREEBLOCK) {
-        __osMemset((void*)((u32)node + sizeof(ArenaNode)), BLOCK_FREE_MAGIC, node->size);
-    }
+    FILL_FREE_BLOCK_CONTENTS(arena, node);
 
-    newNext = next;
     if ((u32)next == (u32)node + sizeof(ArenaNode) + node->size && next->isFree) {
-        newNext = ArenaImpl_GetNextBlock(next);
+        ArenaNode* newNext = NODE_GET_NEXT(next);
         if (newNext != NULL) {
             newNext->prev = node;
         }
 
         node->size += next->size + sizeof(ArenaNode);
-        if (arena->flag & FILL_FREEBLOCK) {
-            __osMemset(next, BLOCK_FREE_MAGIC, sizeof(ArenaNode));
-        }
+        FILL_FREE_BLOCK_HEADER(arena, next);
         node->next = newNext;
         next = newNext;
     }
@@ -466,9 +517,7 @@ void __osFree_NoLock(Arena* arena, void* ptr) {
         }
         prev->next = next;
         prev->size += node->size + sizeof(ArenaNode);
-        if (arena->flag & FILL_FREEBLOCK) {
-            __osMemset(node, BLOCK_FREE_MAGIC, sizeof(ArenaNode));
-        }
+        FILL_FREE_BLOCK_HEADER(arena, node);
     }
 }
 
@@ -478,6 +527,7 @@ void __osFree(Arena* arena, void* ptr) {
     ArenaImpl_Unlock(arena);
 }
 
+#if OOT_DEBUG
 void __osFree_NoLockDebug(Arena* arena, void* ptr, const char* file, s32 line) {
     ArenaNode* node;
     ArenaNode* next;
@@ -491,41 +541,37 @@ void __osFree_NoLockDebug(Arena* arena, void* ptr, const char* file, s32 line) {
     node = (ArenaNode*)((u32)ptr - sizeof(ArenaNode));
     if (node == NULL || node->magic != NODE_MAGIC) {
         // "__osFree: Unauthorized release (%08x)"
-        osSyncPrintf(VT_COL(RED, WHITE) "__osFree:不正解放(%08x) [%s:%d ]\n" VT_RST, ptr, file, line);
+        PRINTF(VT_COL(RED, WHITE) "__osFree:不正解放(%08x) [%s:%d ]\n" VT_RST, ptr, file, line);
         return;
     }
     if (node->isFree) {
         // "__osFree: Double release (%08x)"
-        osSyncPrintf(VT_COL(RED, WHITE) "__osFree:二重解放(%08x) [%s:%d ]\n" VT_RST, ptr, file, line);
+        PRINTF(VT_COL(RED, WHITE) "__osFree:二重解放(%08x) [%s:%d ]\n" VT_RST, ptr, file, line);
         return;
     }
     if (arena != node->arena && arena != NULL) {
         // "__osFree:Tried to release in a different way than when it was secured (%08x:%08x)"
-        osSyncPrintf(VT_COL(RED, WHITE) "__osFree:確保時と違う方法で解放しようとした (%08x:%08x)\n" VT_RST, arena,
-                     node->arena);
+        PRINTF(VT_COL(RED, WHITE) "__osFree:確保時と違う方法で解放しようとした (%08x:%08x)\n" VT_RST, arena,
+               node->arena);
         return;
     }
 
-    next = ArenaImpl_GetNextBlock(node);
-    prev = ArenaImpl_GetPrevBlock(node);
+    next = NODE_GET_NEXT(node);
+    prev = NODE_GET_PREV(node);
     node->isFree = true;
-    ArenaImpl_SetDebugInfo(node, file, line, arena);
+    SET_DEBUG_INFO(node, file, line, arena);
 
-    if (arena->flag & FILL_FREEBLOCK) {
-        __osMemset((void*)((u32)node + sizeof(ArenaNode)), BLOCK_FREE_MAGIC, node->size);
-    }
+    FILL_FREE_BLOCK_CONTENTS(arena, node);
 
     newNext = node->next;
     if ((u32)next == (u32)node + sizeof(ArenaNode) + node->size && next->isFree) {
-        newNext = ArenaImpl_GetNextBlock(next);
+        newNext = NODE_GET_NEXT(next);
         if (newNext != NULL) {
             newNext->prev = node;
         }
 
         node->size += next->size + sizeof(ArenaNode);
-        if (arena->flag & FILL_FREEBLOCK) {
-            __osMemset(next, BLOCK_FREE_MAGIC, sizeof(ArenaNode));
-        }
+        FILL_FREE_BLOCK_HEADER(arena, next);
         node->next = newNext;
         next = newNext;
     }
@@ -536,9 +582,7 @@ void __osFree_NoLockDebug(Arena* arena, void* ptr, const char* file, s32 line) {
         }
         prev->next = next;
         prev->size += node->size + sizeof(ArenaNode);
-        if (arena->flag & FILL_FREEBLOCK) {
-            __osMemset(node, BLOCK_FREE_MAGIC, sizeof(ArenaNode));
-        }
+        FILL_FREE_BLOCK_HEADER(arena, node);
     }
 }
 
@@ -547,10 +591,11 @@ void __osFreeDebug(Arena* arena, void* ptr, const char* file, s32 line) {
     __osFree_NoLockDebug(arena, ptr, file, line);
     ArenaImpl_Unlock(arena);
 }
+#endif
 
 void* __osRealloc(Arena* arena, void* ptr, u32 newSize) {
-    void* newAlloc;
     ArenaNode* node;
+    void* newAlloc;
     ArenaNode* next;
     ArenaNode* newNext;
     ArenaNode* overNext;
@@ -577,20 +622,20 @@ void* __osRealloc(Arena* arena, void* ptr, u32 newSize) {
             // "Does nothing because the memory block size does not change"
             osSyncPrintf("メモリブロックサイズが変わらないためなにもしません\n");
         } else if (node->size < newSize) {
-            next = ArenaImpl_GetNextBlock(node);
+            next = NODE_GET_NEXT(node);
             sizeDiff = newSize - node->size;
             if ((u32)next == ((u32)node + node->size + sizeof(ArenaNode)) && next->isFree && next->size >= sizeDiff) {
                 // "Merge because there is a free block after the current memory block"
                 osSyncPrintf("現メモリブロックの後ろにフリーブロックがあるので結合します\n");
                 next->size -= sizeDiff;
-                overNext = ArenaImpl_GetNextBlock(next);
+                overNext = NODE_GET_NEXT(next);
                 newNext = (ArenaNode*)((u32)next + sizeDiff);
                 if (overNext != NULL) {
                     overNext->prev = newNext;
                 }
                 node->next = newNext;
                 node->size = newSize;
-                __osMemmove(newNext, next, sizeof(ArenaNode));
+                __osMemmove(node->next, next, sizeof(ArenaNode));
             } else {
                 // "Allocate a new memory block and move the contents"
                 osSyncPrintf("新たにメモリブロックを確保して内容を移動します\n");
@@ -602,9 +647,10 @@ void* __osRealloc(Arena* arena, void* ptr, u32 newSize) {
                 ptr = newAlloc;
             }
         } else if (newSize < node->size) {
-            next2 = ArenaImpl_GetNextBlock(node);
+            next2 = NODE_GET_NEXT(node);
             if (next2 != NULL && next2->isFree) {
                 blockSize = ALIGN16(newSize) + sizeof(ArenaNode);
+
                 // "Increased free block behind current memory block"
                 osSyncPrintf("現メモリブロックの後ろのフリーブロックを大きくしました\n");
                 newNext2 = (ArenaNode*)((u32)node + blockSize);
@@ -613,23 +659,24 @@ void* __osRealloc(Arena* arena, void* ptr, u32 newSize) {
                 newNext2->size += node->size - newSize;
                 node->next = newNext2;
                 node->size = newSize;
-                overNext2 = ArenaImpl_GetNextBlock(newNext2);
+                overNext2 = NODE_GET_NEXT(newNext2);
                 if (overNext2 != NULL) {
                     overNext2->prev = newNext2;
                 }
             } else if (newSize + sizeof(ArenaNode) < node->size) {
                 blockSize = ALIGN16(newSize) + sizeof(ArenaNode);
+
                 // "Generated because there is no free block after the current memory block"
                 osSyncPrintf("現メモリブロックの後ろにフリーブロックがないので生成します\n");
                 newNext2 = (ArenaNode*)((u32)node + blockSize);
-                newNext2->next = ArenaImpl_GetNextBlock(node);
+                newNext2->next = NODE_GET_NEXT(node);
                 newNext2->prev = node;
                 newNext2->size = node->size - blockSize;
                 newNext2->isFree = true;
                 newNext2->magic = NODE_MAGIC;
                 node->next = newNext2;
                 node->size = newSize;
-                overNext2 = ArenaImpl_GetNextBlock(newNext2);
+                overNext2 = NODE_GET_NEXT(newNext2);
                 if (overNext2 != NULL) {
                     overNext2->prev = newNext2;
                 }
@@ -639,15 +686,19 @@ void* __osRealloc(Arena* arena, void* ptr, u32 newSize) {
                 ptr = NULL;
             }
         }
+
+        CHECK_ALLOC_FAILURE(arena, ptr);
     }
     ArenaImpl_Unlock(arena);
 
     return ptr;
 }
 
+#if OOT_DEBUG
 void* __osReallocDebug(Arena* arena, void* ptr, u32 newSize, const char* file, s32 line) {
     return __osRealloc(arena, ptr, newSize);
 }
+#endif
 
 void ArenaImpl_GetSizes(Arena* arena, u32* outMaxFree, u32* outFree, u32* outAlloc) {
     ArenaNode* iter;
@@ -669,12 +720,13 @@ void ArenaImpl_GetSizes(Arena* arena, u32* outMaxFree, u32* outFree, u32* outAll
             *outAlloc += iter->size;
         }
 
-        iter = ArenaImpl_GetNextBlock(iter);
+        iter = NODE_GET_NEXT(iter);
     }
 
     ArenaImpl_Unlock(arena);
 }
 
+#if OOT_DEBUG
 void __osDisplayArena(Arena* arena) {
     u32 freeSize;
     u32 allocatedSize;
@@ -737,6 +789,7 @@ void __osDisplayArena(Arena* arena) {
 
     ArenaImpl_Unlock(arena);
 }
+#endif
 
 void ArenaImpl_FaultClient(Arena* arena) {
     u32 freeSize;
@@ -803,7 +856,7 @@ u32 __osCheckArena(Arena* arena) {
             error = 1;
             break;
         }
-        iter = ArenaImpl_GetNextBlock(iter);
+        iter = NODE_GET_NEXT(iter);
     }
     if (error == 0) {
         osSyncPrintf("アリーナはまだ、いけそうです\n"); // "The arena is still going well"
@@ -813,6 +866,8 @@ u32 __osCheckArena(Arena* arena) {
     return error;
 }
 
-u8 func_800FF334(Arena* arena) {
-    return arena->unk_20;
+#if OOT_DEBUG
+u8 ArenaImpl_GetAllocFailures(Arena* arena) {
+    return arena->allocFailures;
 }
+#endif