diff --git a/docs/benchmarks.csv b/docs/benchmarks.csv
index 770068a..ff4d1da 100644
--- a/docs/benchmarks.csv
+++ b/docs/benchmarks.csv
@@ -1,5 +1,5 @@
-pydantic,,24.8μs,0.257μs
-toasted-marshmallow,1.6x slower,39.5μs,0.134μs
-marshmallow,1.9x slower,47.4μs,0.181μs
-trafaret,2.3x slower,56.1μs,0.253μs
-django-restful-framework,16.0x slower,397.5μs,0.382μs
+pydantic,,12.0μs,0.263μs
+toasted-marshmallow,1.9x slower,22.7μs,0.186μs
+marshmallow,2.1x slower,25.2μs,0.173μs
+trafaret,2.2x slower,26.6μs,0.259μs
+django-restful-framework,20.0x slower,240.7μs,1.410μs
diff --git a/docs/index.rst b/docs/index.rst
index 65d7d63..9568692 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -886,8 +886,20 @@ Below are the results of crude benchmarks comparing *pydantic* to other validati
    :align: center
    :file: benchmarks.csv
 
-(See `the benchmarks code <https://github.com/samuelcolvin/pydantic/tree/master/benchmarks>`_
-for more details on the test case. Feel free to submit more benchmarks or improve an existing one.)
+See `the benchmarks code <https://github.com/samuelcolvin/pydantic/tree/master/benchmarks>`_
+for more details on the test case. Feel free to submit more benchmarks or improve an existing one.
+
+Benchmarks were run with python 3.7.2 and the following package versions:
+
+* **pydantic** pre ``v0.27``
+  `d473f4a <https://github.com/samuelcolvin/pydantic/commit/d473f4abc9d040c8c90e102017aacfc078f0f37d>`_ compiled with
+  cython
+* **toasted-marshmallow** ``v0.2.6``
+* **marshmallow** the version installed by ``toasted-marshmallow``, see
+  `this <https://github.com/lyft/toasted-marshmallow/issues/9>`_ issue.
+* **trafaret** ``v1.2.0``
+* **django-restful-framework** ``v3.9.4``
+
 
 Contributing to Pydantic
 ------------------------
diff --git a/setup.py b/setup.py
index 85dc463..a3e1a22 100644
--- a/setup.py
+++ b/setup.py
@@ -54,6 +54,7 @@ if 'clean' not in sys.argv and 'SKIP_CYTHON' not in os.environ:
         compiler_directives = {}
         if 'CYTHON_TRACE' in sys.argv:
             compiler_directives['linetrace'] = True
+        os.environ['CFLAGS'] = '-O3'
         ext_modules = cythonize(
             'pydantic/*.py',
             nthreads=4,