Best result of several trials.
X:\measurements>rci bench core_require_empty
ruby 2.0.0dev (2012-08-07 trunk 36652) [i386-mingw32]
Rehearsal ------------------------------------------------------
core_require_empty 0.858000 2.043000 2.901000 ( 2.995205)
--------------------------------------------- total: 2.901000sec
user system total real
core_require_empty 0.967000 1.904000 2.871000 ( 2.932805)
X:\measurements>rci bench core_require_nested
ruby 2.0.0dev (2012-08-07 trunk 36652) [i386-mingw32]
Rehearsal -------------------------------------------------------
core_require_nested 1.014000 2.324000 3.338000 ( 3.432006)
---------------------------------------------- total: 3.338000sec
user system total real
core_require_nested 0.998000 2.371000 3.369000 ( 3.416406)
X:\measurements>rci bench core_require_empty
ruby 2.0.0dev (2012-08-07 trunk 36652) [i386-mingw32]
Rehearsal ------------------------------------------------------
core_require_empty 0.795000 1.825000 2.620000 ( 2.870405)
--------------------------------------------- total: 2.620000sec
user system total real
core_require_empty 0.733000 1.934000 2.667000 ( 2.792405)
X:\measurements>rci bench core_require_nested
ruby 2.0.0dev (2012-08-07 trunk 36652) [i386-mingw32]
Rehearsal -------------------------------------------------------
core_require_nested 1.014000 1.935000 2.949000 ( 2.995206)
---------------------------------------------- total: 2.949000sec
user system total real
core_require_nested 1.092000 1.809000 2.901000 ( 2.964005)
Rails 3.2.7 empty app
X:\a\b\c\d\e\f\g\empty>timer ruby script\rails r 'p $:.size, $".size'
57
759
real 4.040
system 2.433
user 1.560
X:\a\b\c\d\e\f\g\empty>timer ruby script\rails r 'p $:.size, $".size'
57
759
real 3.900
system 2.199
user 1.606