bench.log

~/pandas/asv_bench$ asv continuous -e 6c30cbecf8 upstream/master
     before     after       ratio
  [6c30cbec] [e5ed87b3]
+  390.54μs     3.23ms      8.27  stat_ops.stats_rolling_mean.time_rolling_sum
+  686.33μs     3.47ms      5.06  stat_ops.stats_rolling_mean.time_rolling_mean
+   22.32ms   110.21ms      4.94  gil.nogil_rolling_algos_fast.time_nogil_rolling_mean
+   69.84ms   305.07ms      4.37  groupby.groupby_multi.time_groupby_multi_python
+   14.66ms    57.83ms      3.95  timedelta.timedelta_convert_string.time_timedelta_convert_string
+    1.01ms     3.86ms      3.82  stat_ops.stats_rolling_mean.time_rolling_var
+   17.75ms    56.57ms      3.19  timedelta.timedelta_convert_string_seconds.time_timedelta_convert_string_seconds
+   40.71ms   122.51ms      3.01  gil.nogil_rolling_algos_fast.time_nogil_rolling_max
+    1.54ms     4.21ms      2.74  stat_ops.stats_rolling_mean.time_rolling_min
+   45.89ms   124.66ms      2.72  io_bench.frame_to_csv.time_frame_to_csv
+    1.65ms     4.48ms      2.71  stat_ops.stats_rolling_mean.time_rolling_std
+    1.59ms     4.25ms      2.67  stat_ops.stats_rolling_mean.time_rolling_max
+    2.96ms     7.87ms      2.66  groupby.groupby_frame_cython_many_columns.time_sum
+   45.48ms   120.95ms      2.66  gil.nogil_rolling_algos_fast.time_nogil_rolling_min
+   43.05ms   111.76ms      2.60  gil.nogil_rolling_algos_fast.time_nogil_rolling_var
+  571.07μs     1.43ms      2.50  groupby.groupby_ngroups_100.time_tail
+  590.70μs     1.45ms      2.46  groupby.groupby_ngroups_100.time_head
+   64.24ms   152.94ms      2.38  gil.nogil_rolling_algos_fast.time_nogil_rolling_kurt
+   58.13ms   131.06ms      2.25  gil.nogil_rolling_algos_fast.time_nogil_rolling_std
+   98.64ms   209.74ms      2.13  io_bench.frame_to_csv2.time_frame_to_csv2
+   29.49ms    60.02ms      2.04  eval.eval_frame.time_mult('numexpr', 'all')
-  643.24ms   263.41ms      0.41  join_merge.concat_panels.time_concat_f_ordered_axis0
-  144.97ms    33.06ms      0.23  join_merge.concat_dataframes.time_concat_c_ordered_axis0
-  441.98ms    63.10ms      0.14  join_merge.concat_panels.time_concat_f_ordered_axis1
-  443.15ms    63.20ms      0.14  join_merge.concat_panels.time_concat_f_ordered_axis2
-     2.73s   213.84ms      0.08  timeseries.timeseries_to_datetime_iso8601.time_timeseries_to_datetime_iso8601_tz_spaceformat
-   20.08ms   982.28μs      0.05  categoricals.categorical_constructor_with_datetimes.time_datetimes_with_nat
-  107.86ms     3.78ms      0.04  timeseries.timeseries_to_datetime_iso8601.time_timeseries_to_datetime_iso8601_format_no_sep
-   95.91ms     2.07ms      0.02  parser_vb.read_table_multiple_date_baseline.time_read_table_multiple_date_baseline
-     1.90s     3.71ms      0.00  timeseries.timeseries_to_datetime_iso8601.time_timeseries_to_datetime_iso8601_nosep
SOME BENCHMARKS HAVE CHANGED SIGNIFICANTLY.