diff --git a/Week04/decorators_beytullah_arslan.py b/Week04/decorators_beytullah_arslan.py
new file mode 100644
index 00000000..3ac9f3fa
--- /dev/null
+++ b/Week04/decorators_beytullah_arslan.py
@@ -0,0 +1,31 @@
+import time
+import tracemalloc
+
+def performance(func):
+    if not hasattr(performance, 'counter'):
+        performance.counter = 0
+        performance.total_time = 0.0
+        performance.total_mem = 0.0
+    def wrapper(*args, **kwargs):
+        # 1. Ölçümleri Başlat
+        tracemalloc.start()
+        start_time = time.perf_counter()
+        
+        # 2. Asıl Fonksiyonu Çalıştır
+        result = func(*args, **kwargs)
+        
+        # 3. Ölçümleri Bitir
+        end_time = time.perf_counter()
+        current_mem, peak_mem = tracemalloc.get_traced_memory()
+        tracemalloc.stop()
+        
+        # 4. İstatistikleri Güncelle
+        performance.counter += 1
+        performance.total_time += (end_time - start_time)
+        performance.total_mem += peak_mem
+        
+        return result
+    wrapper.__name__ = func.__name__
+    wrapper.__doc__ = func.__doc__
+    
+    return wrapper