diff --git a/core/hakmem_debug.c b/core/hakmem_debug.c
index 7e077171..c9708eae 100644
--- a/core/hakmem_debug.c
+++ b/core/hakmem_debug.c
@@ -4,6 +4,7 @@
 // Date: 2025-10-21
 
 #include "hakmem_debug.h"
+#include "hakmem_env_cache.h"  // Priority-2: ENV cache
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -150,11 +151,8 @@ void hkm_timing_init(void) {
     if (g_initialized) return;
 
 #if !HAKMEM_BUILD_RELEASE
-    // Check HAKMEM_TIMING environment variable (gated behind !HAKMEM_BUILD_RELEASE)
-    const char* env = getenv("HAKMEM_TIMING");
-    if (env && strcmp(env, "1") == 0) {
-        g_timing_enabled = 1;
-    }
+    // Priority-2: Use cached ENV (gated behind !HAKMEM_BUILD_RELEASE)
+    g_timing_enabled = HAK_ENV_TIMING_ENABLED();
 #else
     g_timing_enabled = 0;  // Always disabled in release builds
 #endif
diff --git a/core/hakmem_env_cache.h b/core/hakmem_env_cache.h
index c3e6bd3f..6b14b0ff 100644
--- a/core/hakmem_env_cache.h
+++ b/core/hakmem_env_cache.h
@@ -84,6 +84,9 @@ typedef struct {
     // ===== Warm Path: SmallMid (1 variable) =====
     int smallmid_enable;             // HAKMEM_SMALLMID_ENABLE (default: 0)
 
+    // ===== Cold Path: Debug/Timing (1 variable) =====
+    int timing_enabled;              // HAKMEM_TIMING (default: 0)
+
 } HakEnvCache;
 
 // Global cache instance (initialized once at startup)
@@ -268,10 +271,17 @@ static inline void hakmem_env_cache_init(void) {
         g_hak_env_cache.smallmid_enable = (e && atoi(e) == 1) ? 1 : 0;  // default: 0 (OFF)
     }
 
+    // ===== Cold Path: Debug/Timing =====
+    {
+        const char* e;
+        e = getenv("HAKMEM_TIMING");
+        g_hak_env_cache.timing_enabled = (e && strcmp(e, "1") == 0) ? 1 : 0;  // default: 0 (OFF)
+    }
+
 #if !HAKMEM_BUILD_RELEASE
     // Debug: Print cache summary (stderr only)
     if (!g_hak_env_cache.quiet) {
-        fprintf(stderr, "[ENV_CACHE_INIT] Parsed %d ENV variables at startup\n", 47);
+        fprintf(stderr, "[ENV_CACHE_INIT] Parsed %d ENV variables at startup\n", 48);
         fprintf(stderr, "[ENV_CACHE_INIT] Hot path syscalls eliminated: ~2000/sec → 0/sec\n");
         fflush(stderr);
     }
@@ -334,4 +344,7 @@ static inline void hakmem_env_cache_init(void) {
 // Warm path: SmallMid
 #define HAK_ENV_SMALLMID_ENABLE()           (g_hak_env_cache.smallmid_enable)
 
+// Cold path: Debug/Timing
+#define HAK_ENV_TIMING_ENABLED()            (g_hak_env_cache.timing_enabled)
+
 #endif // HAKMEM_ENV_CACHE_H