Alexandre Vassalotti <[EMAIL PROTECTED]> added the comment:

The slowdown depends of the array type. The patch makes array unpickling
a few orders of magnitude slower (i.e. between 4 and 15 times slower
depending of the array type). In general, pickling is about as fast as
with the binary representation (or faster!). 

Although since most 64-bit compilers uses the LP64 model, I think we
could make a compromise and only pickle as a list arrays of long
integers. This would fix the problem without any visible speed penalties.

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Python tracker <[EMAIL PROTECTED]>
<http://bugs.python.org/issue2389>
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