New issue 1779: im.point() 4000x slower than CPython
https://bitbucket.org/pypy/pypy/issue/1779/impoint-4000x-slower-than-cpython
hugovk:
The following code takes nearly 4000 times longer on PyPy 2.2.1 compared with
CPython. It takes less than a second with CPython compared with over 5 minutes
on PyPy:
```
#!/usr/bin/env python
from PIL import Image
im = Image.open("lena.ppm")
im.point(list(range(256))*3)
im.point(lambda x: x)
im = im.convert("I")
im.point(lambda x: x*1)
im.point(lambda x: x+1)
im.point(lambda x: x*1+1)
im.point(list(range(256))*256, 'L')
```
Test code:
https://github.com/hugovk/test/tree/484
```
2.6 0m0.098s
2.7 0m0.042s
3.2 0m0.106s
3.3 0m0.094s
3.4 0m0.069s
PyPy 5m16.867s
```
PyPy time / average CPython time = 3873.6797066
Timings from:
https://travis-ci.org/hugovk/test/builds/26190010
The code is a simplified form of a Pillow test. At the moment it is skipped for
PyPy as it takes too long. No coverage is involved.
I've not tested on PyPy 2.3.
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