Unpickling e.g. a large list seems to be really slow in Python 3.0.

The attached test script gives the following results for pickling and
unpickling a list of 1M zeros, showing that although the C
implementation seems to be used in Python 3.0, unpickling is even slower
than with the "pickle" module of Python 2.6!

[hagenf@cluster-06 hagenf]$ python pickletst.py
2.71067500114
2.77484893799
[hagenf@cluster-06 hagenf]$ python3.0 pickletst.py
0.0925059318542
5.76121616364