XHProf: Hierarchical Profiler Report

Diff Report: Run #5391fc871e91d: XHProf Run (Namespace=drupal-perf-drupalcon)
vs.
Run #5391fd5a43e70: XHProf Run (Namespace=drupal-perf-drupalcon)
Tip: Click a function name below to drill down.

Drupal\Core\Datetime\DrupalDateTime::format	Run #5391fc871e91d	Run #5391fd5a43e70	Diff	Diff%
Number of Function Calls	12	12	0	0.0%
Incl. Wall Time (microsec)	530	525	-5	-0.9%
Incl. Wall Time (microsec) per call	44	44	-0	-0.9%
Excl. Wall Time (microsec)	203	208	5	2.5%
Incl. CPU (microsecs)	545	538	-7	-1.3%
Incl. CPU (microsecs) per call	45	45	-1	-1.3%
Excl. CPU (microsec)	175	172	-3	-1.7%
Incl. MemUse (bytes)	7,516	7,516	0	0.0%
Incl. MemUse (bytes) per call	626	626	0	0.0%
Excl. MemUse (bytes)	552	552	0	0.0%
Incl. PeakMemUse (bytes)	8,584	8,556	-28	-0.3%
Incl. PeakMemUse (bytes) per call	715	713	-2	-0.3%
Excl. PeakMemUse (bytes)	4,856	4,856	0	0.0%

Function Name	Calls Diff	Calls Diff%	Incl. Wall Diff (microsec)	IWall Diff%	Incl. CPU Diff (microsec)	ICpu Diff%	Incl. MemUse Diff (bytes)	IMemUse Diff%	Incl. PeakMemUse Diff (bytes)	IPeakMemUse Diff%
*Current Function*
Drupal\Core\Datetime\DrupalDateTime::format	0	N/A%	-5	-0.3%	-7	-1.8%	0	0.0%	-28	-0.1%
Exclusive Metrics Diff for Current Function			5	100.0%	-3	-42.9%	0	N/A%	0	0.0%
*Parent functions*
datetime_format_example	0	N/A%	7	140.0%	6	85.7%	0	N/A%	-32	-114.3%
datetime_datetime_form_process	0	N/A%	-7	-140.0%	-5	-71.4%	0	N/A%	0	0.0%
form_type_datetime_value	0	N/A%	-4	-80.0%	-5	-71.4%	0	N/A%	0	0.0%
Drupal\Component\Datetime\DateTimePlus::__toString	0	N/A%	-1	-20.0%	-3	-42.9%	0	N/A%	4	14.3%
datetime_range_years	0	N/A%	0	0.0%	0	0.0%	0	N/A%	0	0.0%
*Child functions*
Drupal\Component\Datetime\DateTimePlus::format	0	N/A%	-9	-180.0%	-9	-128.6%	0	N/A%	0	0.0%
preg_replace_callback	0	N/A%	-3	-60.0%	3	42.9%	0	N/A%	0	0.0%
preg_replace	0	N/A%	2	40.0%	-2	-28.6%	0	N/A%	-28	-100.0%
_format_date_callback	0	N/A%	0	0.0%	4	57.1%	0	N/A%	0	0.0%