New issue 2249: re.sub() is 5 times slower than with CPython
https://bitbucket.org/pypy/pypy/issues/2249/resub-is-5-times-slower-than-with-cpython
Amaury Forgeot d'Arc:
The script below is 5 times slower with PyPy than with CPython.
I suspect the code could be optimized by using a StringBuilder instead of
`space.call_method( w_emptystr, 'join', space.newlist(sublist_w))`
```
#!python
import re, time
regexp = re.compile('x')
s = 'x' * 1024 * 1024 * 10
def f():
for x in xrange(10):
t0 = time.time()
assert len(regexp.sub('y', s)) == len(s)
print time.time() - t0
f()
```
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