diff --git a/core/box/free_local_box.c b/core/box/free_local_box.c
index 23f65f2b..cb915c2c 100644
--- a/core/box/free_local_box.c
+++ b/core/box/free_local_box.c
@@ -30,6 +30,7 @@ void tiny_free_local_box(SuperSlab* ss, int slab_idx, TinySlabMeta* meta, void*
     void* base = (void*)((uint8_t*)ptr - 1);
 
     // Targeted header integrity check (env: HAKMEM_TINY_SLL_DIAG, C7 focus)
+#if !HAKMEM_BUILD_RELEASE
     do {
         static int g_free_diag_en = -1;
         static _Atomic uint32_t g_free_diag_shot = 0;
@@ -56,6 +57,7 @@ void tiny_free_local_box(SuperSlab* ss, int slab_idx, TinySlabMeta* meta, void*
             }
         }
     } while (0);
+#endif
 
     if (__builtin_expect(tiny_refill_failfast_level() >= 2, 0)) {
         int actual_idx = slab_index_for(ss, base);
@@ -77,6 +79,7 @@ void tiny_free_local_box(SuperSlab* ss, int slab_idx, TinySlabMeta* meta, void*
     void* prev = meta->freelist;
 
     // Detect suspicious prev before writing next (env-gated)
+#if !HAKMEM_BUILD_RELEASE
     do {
         static int g_prev_diag_en = -1;
         static _Atomic uint32_t g_prev_diag_shot = 0;
@@ -100,6 +103,7 @@ void tiny_free_local_box(SuperSlab* ss, int slab_idx, TinySlabMeta* meta, void*
             }
         }
     } while (0);
+#endif
 
     // FREELIST CORRUPTION DEBUG: Validate pointer before writing
     if (__builtin_expect(tiny_refill_failfast_level() >= 2, 0)) {
@@ -157,6 +161,7 @@ void tiny_free_local_box(SuperSlab* ss, int slab_idx, TinySlabMeta* meta, void*
     atomic_thread_fence(memory_order_release);
 
     // Optional freelist mask update on first push
+#if !HAKMEM_BUILD_RELEASE
     do {
         static int g_mask_en = -1;
         if (__builtin_expect(g_mask_en == -1, 0)) {
@@ -168,6 +173,7 @@ void tiny_free_local_box(SuperSlab* ss, int slab_idx, TinySlabMeta* meta, void*
             atomic_fetch_or_explicit(&ss->freelist_mask, bit, memory_order_release);
         }
     } while (0);
+#endif
 
     // Track local free (debug helpers may be no-op)
     tiny_remote_track_on_local_free(ss, slab_idx, ptr, "local_free", my_tid);
@@ -180,11 +186,15 @@ void tiny_free_local_box(SuperSlab* ss, int slab_idx, TinySlabMeta* meta, void*
         ss_mark_slab_empty(ss, slab_idx);
 
         // DEBUG LOGGING - Track when used reaches 0
+#if !HAKMEM_BUILD_RELEASE
         static int dbg = -1;
         if (__builtin_expect(dbg == -1, 0)) {
             const char* e = getenv("HAKMEM_SS_FREE_DEBUG");
             dbg = (e && *e && *e != '0') ? 1 : 0;
         }
+#else
+        const int dbg = 0;
+#endif
         if (dbg == 1) {
             fprintf(stderr, "[FREE_LOCAL_BOX] EMPTY detected: cls=%u ss=%p slab=%d empty_mask=0x%x empty_count=%u\n",
                     cls, (void*)ss, slab_idx, ss->empty_mask, ss->empty_count);