diff --git a/CHANGES.rst b/CHANGES.rst
index cff2189..a998307 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -4,7 +4,7 @@ CHANGES
 2.1.x
 -----
 
-- xxxx
+- disable LTO because become poor performance
 
 2.1.3 (2018-09-26)
 ------------------
diff --git a/Makefile b/Makefile
index 0d889b6..d7d8879 100644
--- a/Makefile
+++ b/Makefile
@@ -19,17 +19,7 @@ install: clean
 build-manylinux1-wheel:
 	docker pull quay.io/pypa/manylinux1_i686
 	docker pull quay.io/pypa/manylinux1_x86_64
-	docker run --rm -ti -v `pwd`:/project \
-		-e CFLAGS="-mtune=generic -pipe -fPIC -flto" \
-		-e LDFLAGS="$(LDFLAGS) -flto" \
-		-w /project \
-		quay.io/pypa/manylinux1_i686 \
-		bash dockerfiles/buildwheel.sh
-	docker run --rm -ti -v `pwd`:/project \
-		-e CFLAGS="-mtune=generic -pipe -fPIC -flto" \
-		-e LDFLAGS="$(LDFLAGS) -flto" \
-		-w /project \
-		quay.io/pypa/manylinux1_x86_64 \
-		bash dockerfiles/buildwheel.sh
+	docker run --rm -ti -v `pwd`:/project -w /project quay.io/pypa/manylinux1_i686   bash dockerfiles/buildwheel.sh
+	docker run --rm -ti -v `pwd`:/project -w /project quay.io/pypa/manylinux1_x86_64 bash dockerfiles/buildwheel.sh
 
 build: clean pip test sdist build-manylinux1-wheel
diff --git a/requirements-dev.txt b/requirements-dev.txt
index b90c5d3..0ad58b2 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -3,3 +3,5 @@ Cython==0.28.5
 nose==1.3.7
 tox==3.4.0
 wheel==0.31.1
+#autopep8==1.4
+#pylint==2.1.1
diff --git a/setup.py b/setup.py
index b427eca..04a5b18 100644
--- a/setup.py
+++ b/setup.py
@@ -26,7 +26,8 @@ uchardet_dir = 'src/ext/uchardet/src'
 if have_cython:
     pyx_sources = glob.glob(cchardet_dir + '*.pyx')
     sys.stderr.write('cythonize: %r\n' % (pyx_sources,))
-    cython_compiler.compile(pyx_sources, options=cython_compiler.CompilationOptions(cplus=True))
+    cython_compiler.compile(
+        pyx_sources, options=cython_compiler.CompilationOptions(cplus=True))
 
 cchardet_sources = glob.glob(cchardet_dir + '*.cpp')
 sources = cchardet_sources
@@ -89,6 +90,8 @@ cfg_vars = sysconfig.get_config_vars()
 for key, value in cfg_vars.items():
     if type(value) == str:
         cfg_vars[key] = value.replace("-Wstrict-prototypes", "")
+        # O3を指定したところで速度が向上するかは疑問である
+        # cfg_vars[key] = value.replace("-O2", "-O3")
 
 cchardet_module = Extension(
     'cchardet._cchardet',
@@ -97,12 +100,15 @@ cchardet_module = Extension(
     language='c++',
 )
 
+
 def read(f):
     return open(os.path.join(os.path.dirname(__file__), f)).read().strip()
 
+
 with codecs.open(os.path.join(os.path.abspath(os.path.dirname(__file__)), 'src', 'cchardet', 'version.py'), 'r', 'latin1') as fp:
     try:
-        version = re.findall(r"^__version__ = '([^']+)'\r?$", fp.read(), re.M)[0]
+        version = re.findall(
+            r"^__version__ = '([^']+)'\r?$", fp.read(), re.M)[0]
     except IndexError:
         raise RuntimeError('Unable to determine version.')