pydata/pandas — pull request #3333 by jreback (2013-04-12 18:50:22+00:00)
Title: PERF: series construction perf enhancements, use a fast path based on dt...

This is only 1us improvement, but non-zero
(I measure the existing one at 9us, this puts it at 10, before
this change was about 11)

difference is 3 function calls, so not much more we can do I think
(as this is handling more cases)

```
-------------------------------------------------------------------------------
Test name | head[ms] | base[ms] | ratio |
-------------------------------------------------------------------------------
series_constructor_ndarray | 0.0106 | 0.0120 | 0.8874 |
-------------------------------------------------------------------------------
Test name | head[ms] | base[ms] | ratio |
-------------------------------------------------------------------------------

Ratio < 1.0 means the target commit is faster then the baseline.
Seed used: 1234

Target [c54848f] : PERF: series construction perf enhancements, use a fast path based on dtype
Base [9764ea6] : Merge pull request #3332 from jreback/period_perf2
```