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Avoids a call to _rebuild_blknos_and_blklocs, which in e.g. time_reset_datetimeindex is 34 microseconds

@jbrockmendel jbrockmendel added the Performance Memory or execution speed performance label Aug 27, 2021
@jreback jreback added this to the 1.4 milestone Aug 31, 2021
@jreback jreback merged commit 3b05602 into pandas-dev:master Aug 31, 2021
@jbrockmendel jbrockmendel deleted the perf-copy branch August 31, 2021 23:34
feefladder pushed a commit to feefladder/pandas that referenced this pull request Sep 7, 2021
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