pydata/pandas — pull request #7652 by jreback (2014-07-02 18:02:53+00:00)
Title: PERF: fix perf issue in tz conversions w/o affecting DST transitions

```
-------------------------------------------------------------------------------
Test name | head[ms] | base[ms] | ratio |
-------------------------------------------------------------------------------
datetimeindex_normalize | 3.3297 | 83.0923 | 0.0401 |

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

Target [fc88541] : PERF: allow slice indexers to be computed faster
Base [160419e] : TST: fixes for 2.6 comparisons
```