diff -r 9a1136898539 perf.py
--- a/perf.py	Thu Oct 24 21:59:09 2013 +0200
+++ b/perf.py	Fri Nov 29 20:11:33 2013 -0800
@@ -1631,12 +1631,17 @@
 
 @VersionRange()
 def BM_FastPickle(base_python, changed_python, options):
-    args = ["--use_cpickle", "pickle"]
+    args = ["--use_cpickle", "pickle", "--protocol", "4"]
     return _PickleBenchmark(base_python, changed_python, options, args)
 
 @VersionRange()
 def BM_FastUnpickle(base_python, changed_python, options):
-    args = ["--use_cpickle", "unpickle"]
+    args = ["--use_cpickle", "unpickle", "--protocol", "4"]
+    return _PickleBenchmark(base_python, changed_python, options, args)
+
+@VersionRange()
+def BM_Unpickle_File(base_python, changed_python, options):
+    args = ["--use_cpickle", "unpickle_file", "--protocol", "4"]
     return _PickleBenchmark(base_python, changed_python, options, args)
 
 @VersionRange()
diff -r 9a1136898539 performance/bm_pickle.py
--- a/performance/bm_pickle.py	Thu Oct 24 21:59:09 2013 +0200
+++ b/performance/bm_pickle.py	Fri Nov 29 20:11:33 2013 -0800
@@ -23,6 +23,7 @@
 import random
 import sys
 import time
+import io
 
 # Local imports
 import util
@@ -297,6 +298,56 @@
     return times
 
 
+FRAME_SIZE = 64 * 1024
+STRINGS = [bytes([i >> 8, i & 0xff]) * (FRAME_SIZE // 2) for i in range(512)]
+
+def test_unpickle_file(loops, pickle, options):
+    class SlowReader:
+
+        LOOPS = 1000
+
+        def __init__(self, f):
+            self._read = f.read
+            self.readline = f.readline
+
+        def read(self, n):
+            for _ in range(self.LOOPS): pass
+            return self._read(n)
+
+    def loads(pickled):
+        with io.BytesIO(pickled) as f:
+            pickle.load(SlowReader(f))
+
+    pickled_list = pickle.dumps(STRINGS, options.protocol)
+
+    # Warm-up runs.
+    loads(pickled_list)
+    loads(pickled_list)
+
+    times = []
+    for _ in xrange(options.num_runs):
+        t0 = time.time()
+        loads(pickled_list)
+        loads(pickled_list)
+        loads(pickled_list)
+        loads(pickled_list)
+        loads(pickled_list)
+        loads(pickled_list)
+        loads(pickled_list)
+        loads(pickled_list)
+        loads(pickled_list)
+        loads(pickled_list)
+        loads(pickled_list)
+        loads(pickled_list)
+        loads(pickled_list)
+        loads(pickled_list)
+        loads(pickled_list)
+        loads(pickled_list)
+        t1 = time.time()
+        times.append(t1 - t0)
+    return times
+
+
 MICRO_DICT = dict((key, dict.fromkeys(range(10))) for key in xrange(100))
 
 def test_pickle_dict(loops, pickle, options):
@@ -331,7 +382,7 @@
     options, args = parser.parse_args()
 
     benchmarks = ["pickle", "unpickle", "pickle_list", "unpickle_list",
-                  "pickle_dict"]
+                  "pickle_dict", "unpickle_file"]
     for bench_name in benchmarks:
         if bench_name in args:
             benchmark = globals()["test_" + bench_name]