list-comprehension and map question (simple)

[Cameron Laird]

In article <1112200377.855627.236440 at z14g2000cwz.googlegroups.com>,
runsun pan <runsun at gmail.com> wrote:
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>Secondly, [x+y for x,y in itertools.izip(xs, ys)] did go much faster
>than map(lambda x,y: x+y, xs, ys). The latter is not only the slowest
>one, but with an amazingly slow speed of 15 times slowdown.
>

If I understand the story correctly, this reflects Raymond Hettinger's
extraordinary achievement in making all things iter* really, really
quick.