[issue2306] Update What's new in 3.0

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

The "optimizations" section needn't be so pessimistic. I just compiled
the latest py3k and release2.5-maint branches and py3k is 10% slower
(38000 vs. 42000).

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nosy: +pitrou

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