$ ./perl -Ilib speed_test.pl 0
time delta = 0.623134136199951

$ ./perl -Ilib speed_test.pl 0
time delta = 0.621975898742676

$ ./perl -Ilib speed_test.pl 0
time delta = 0.626943826675415

$ ./perl -Ilib speed_test.pl 1
time delta = 0.636697053909302
SV = IV(0x8400afc) at 0x8400b00
  REFCNT = 1
  FLAGS = (TEMP,ROK)
  RV = 0x83ca0f0
  SV = PVAV(0x83bb1b4) at 0x83ca0f0
    REFCNT = 2
    FLAGS = (PADMY,RMG)
    MAGIC = 0x83c5210
      MG_VIRTUAL = &PL_vtbl_arylen_p
      MG_TYPE = PERL_MAGIC_arylen_p(@)
      MG_FLAGS = 0x02
        REFCOUNTED
      MG_OBJ = 0x83ca280
      SV = PVMG(0x840f42c) at 0x83ca280
        REFCNT = 1
        FLAGS = (GMG,SMG,pIOK)
        IV = 9
        NV = 0
        PV = 0
        MAGIC = 0x83c5230
          MG_VIRTUAL = &PL_vtbl_arylen
          MG_TYPE = PERL_MAGIC_arylen(#)
          MG_OBJ = 0x83ca0f0
    ARRAY = 0x83c5180
    FILL = 9
    MAX = 9
    ARYLEN = 0x83ca280
    FLAGS = (REAL)