Python cStringIO的编写时间比StringIO花费更多的时间(执行字符串方法)

Python cStringIO take more time than StringIO in writing (performance of string methods)

以我的方式在python中分析字符串方法，以便可以使用最快的方法。
我有这段代码可以测试文件，StringIO，StringIO和普通字符串中的字符串连接。

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#!/usr/bin/env python
#title : pythonTiming.py
#description : Will be used to test timing function in python
#author : myusuf
#date : 19-11-2014
#version : 0
#usage :python pythonTiming.py
#notes :
#python_version :2.6.6
#==============================================================================

import time
import cStringIO
import StringIO

class Timer(object):

def __enter__(self):
self.start = time.time()
return self

def __exit__(self, *args):
self.end = time.time()
self.interval = self.end - self.start

testbuf =""" Hello This is a General String that will be repreated
This string will be written to a file , StringIO and a sregualr strin then see the best to handle string according to time

""" * 1000

MyFile = open("./testfile.txt" ,"wb+")
MyStr = ''
MyStrIo = StringIO.StringIO()
MycStrIo = cStringIO.StringIO()

def strWithFiles():
global MyFile
print"writing string to file"
for index in range(1000):
MyFile.write(testbuf)
pass

def strWithStringIO():
global MyStrIo
print"writing string to StrinIO"
for index in range(1000):
MyStrIo.write(testbuf)

def strWithStr():
global MyStr
print"Writing String to STR"
for index in range(500):
MyStr = MyStr + testbuf

def strWithCstr():
global MycStrIo
print"writing String to Cstring"
for index in range(1000):
MycStrIo.write(testbuf)

with Timer() as t:
strWithFiles()
print('##Request took %.03f sec.' % t.interval)

with Timer() as t:
strWithStringIO()
print('###Request took %.03f sec.' % t.interval)

with Timer() as t:
strWithCstr()
print('####Request took %.03f sec.' % t.interval)

with Timer() as t:
read1 = 'x' + MyFile.read(-1)
print('file read ##Request took %.03f sec.' % t.interval)

with Timer() as t:
read2 = 'x' + MyStrIo.read(-1)
print('stringIo read ###Request took %.03f sec.' % t.interval)

with Timer() as t:
read3 = 'x' + MycStrIo.read(-1)
print('CString read ####Request took %.03f sec.' % t.interval)

MyFile.close()

尽管Python文档站点说cStringIO比StringIO快，但是结果说StringIO在串联中具有更好的性能，为什么？

另一方面，当我读取文件的实现并且cStringIO在C语言中时，从cStringIO读取要比StringIO快(其行为与file相似)，那么为什么字符串连接速度很慢？

还有没有其他方法可以比这些方法更快地处理字符串？