PERF: some regressions
http://pydata.github.io/pandas/# is a view since 0.14 (its not every tag, but a sampling).
The regressions pages is now working [here](http://pydata.github.io/pandas/#regressions?sort=3&dir=desc)
- [ ] http://pydata.github.io/pandas/#groupby.groupby_indices.time_groupby_indices
- [ ] http://pydata.github.io/pandas/#frame_ctor.frame_ctor_nested_dict_int64.time_frame_ctor_nested_dict_int64 (#11158)
- [ ] http://pydata.github.io/pandas/#index_object.index_int64_intersection.time_index_int64_intersection
- [ ] http://pydata.github.io/pandas/#groupby.groupby_ngroups_100_cumprod.time_groupby_ngroups_100_cumprod
- [ ] http://pydata.github.io/pandas/#frame_methods.frame_get_dtype_counts.time_frame_get_dtype_counts
- [ ] http://pydata.github.io/pandas/#ctors.index_from_series_ctor.time_index_from_series_ctor
- [ ] http://pydata.github.io/pandas/#binary_ops.frame_multi_and_st.time_frame_multi_and_st
- [ ] http://pydata.github.io/pandas/#indexing.series_loc_list_like.time_series_loc_list_like

timeseries / period related:
- [x] http://pydata.github.io/pandas/#plotting.plot_timeseries_period.time_plot_timeseries_period (#11194)
- [ ] http://pydata.github.io/pandas/#timeseries.timeseries_iter_periodindex.time_timeseries_iter_periodindex
- [ ] http://pydata.github.io/pandas/#timeseries.period_setitem.time_period_setitem
- [ ] http://pydata.github.io/pandas/#timeseries.datetimeindex_normalize.time_datetimeindex_normalize
- [ ] http://pydata.github.io/pandas/#timeseries.dataframe_resample_max_string.time_dataframe_resample_max_string
