Python 2.0b1 List comprehensions are slow

[Guido van Rossum]

Agreed with Tim -- let's do this after 2.0 final.

Someone else once mailed me a different patch for list optimization
-- allow extra allocated memory at the front too, so that some forms
of insert() can be much faster.  Another idea would be to maintain a
"gap" like the Emacs buffer implementation.

--Guido van Rossum (home page: http://www.pythonlabs.com/~guido/)