PERF: perf regressions vs 0.14.0
We have many + perf fixes in 0.14.1 yeh!

but need to look at these (resamples could be spurious)

```
dataframe_resample_mean_string               |   4.0483 |   2.4170 |   1.6749 |
dataframe_resample_max_numpy                 |   3.3394 |   1.7230 |   1.9381 |
dataframe_resample_max_string                |   3.3154 |   1.7047 |   1.9448 |
dataframe_resample_min_numpy                 |   3.3020 |   1.6843 |   1.9604 |
dataframe_resample_min_string                |   3.2830 |   1.6587 |   1.9793 |
timeseries_timestamp_downsample_mean         |  11.4803 |   4.0847 |   2.8106 |
timeseries_period_downsample_mean            |  29.7631 |  10.3510 |   2.8754 |
datetimeindex_normalize                      |  77.5570 |   3.0633 |  25.3183 |
-------------------------------------------------------------------------------
Test name                                    | head[ms] | base[ms] |  ratio   |
-------------------------------------------------------------------------------

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

Target [272dae5] : BUG: doc example in groupby.rst (GH7559 / GH7628)
Base   [da0f7ae] : RLS: 0.14.0 final
```
