diff --git a/core/tiny_alloc_fast.inc.h b/core/tiny_alloc_fast.inc.h
index 75e6a653..2e7b17a6 100644
--- a/core/tiny_alloc_fast.inc.h
+++ b/core/tiny_alloc_fast.inc.h
@@ -198,6 +198,37 @@ static inline void* tiny_alloc_fast_pop(int class_idx) {
     }
     return NULL;
 #else
+    // ========== Phase 19-1: Quick Prune (Frontend SLIM mode) ==========
+    // ENV: HAKMEM_TINY_FRONT_SLIM=1
+    // Goal: Skip FastCache + SFC layers, go straight to SLL (88-99% hit rate)
+    // Expected: 22M → 27-30M ops/s (+22-36%)
+    static __thread int g_front_slim_checked = 0;
+    static __thread int g_front_slim_enabled = 0;
+
+    if (__builtin_expect(!g_front_slim_checked, 0)) {
+        const char* e = getenv("HAKMEM_TINY_FRONT_SLIM");
+        g_front_slim_enabled = (e && *e && *e != '0') ? 1 : 0;
+        g_front_slim_checked = 1;
+    }
+
+    // SLIM MODE: Skip FastCache + SFC, go straight to SLL
+    if (__builtin_expect(g_front_slim_enabled, 0)) {
+        // Box Boundary: TLS SLL freelist pop (only layer in SLIM mode)
+        extern int g_tls_sll_enable;
+        if (__builtin_expect(g_tls_sll_enable, 1)) {
+            void* base = NULL;
+            if (tls_sll_pop(class_idx, &base)) {
+                // Front Gate: SLL hit (SLIM fast path - 3 instructions)
+                extern unsigned long long g_front_sll_hit[];
+                g_front_sll_hit[class_idx]++;
+                return base;
+            }
+        }
+        // SLIM mode miss → return NULL (caller refills)
+        return NULL;
+    }
+    // ========== End Phase 19-1: Quick Prune ==========
+
     // Phase 7 Task 3: Profiling overhead removed in release builds
     // In release mode, compiler can completely eliminate profiling code
 #if !HAKMEM_BUILD_RELEASE