diff --git a/Tools/pybench/Calls.py b/Tools/pybench/Calls.py
index 72ccd0e..e27798b 100644
--- a/Tools/pybench/Calls.py
+++ b/Tools/pybench/Calls.py
@@ -109,6 +109,64 @@
 
 ###
 
+class ComplexPythonFunctionCalls(Test):
+
+    version = 2.0
+    operations = 4*5
+    rounds = 100000
+
+    def test(self):
+
+        # define functions
+        def f(a,b,c,d=1,e=2,f=3):
+            return f
+
+        args = 1,2
+        kwargs = dict(c=3,d=4,e=5)
+
+        # do calls
+        for i in xrange(self.rounds):
+            f(a=i,b=i,c=i)
+            f(f=i,e=i,d=i,c=2,b=i,a=3)
+            f(1,b=i,**kwargs)
+            f(*args,**kwargs)
+
+            f(a=i,b=i,c=i)
+            f(f=i,e=i,d=i,c=2,b=i,a=3)
+            f(1,b=i,**kwargs)
+            f(*args,**kwargs)
+
+            f(a=i,b=i,c=i)
+            f(f=i,e=i,d=i,c=2,b=i,a=3)
+            f(1,b=i,**kwargs)
+            f(*args,**kwargs)
+
+            f(a=i,b=i,c=i)
+            f(f=i,e=i,d=i,c=2,b=i,a=3)
+            f(1,b=i,**kwargs)
+            f(*args,**kwargs)
+
+            f(a=i,b=i,c=i)
+            f(f=i,e=i,d=i,c=2,b=i,a=3)
+            f(1,b=i,**kwargs)
+            f(*args,**kwargs)
+
+
+    def calibrate(self):
+
+        # define functions
+        def f(a,b,c,d=1,e=2,f=3):
+            return f
+
+        args = 1,2
+        kwargs = dict(c=3,d=4,e=5)
+
+        # do calls
+        for i in xrange(self.rounds):
+            pass
+
+###
+
 class BuiltinFunctionCalls(Test):
 
     version = 2.0