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  1. or download this
    C:\test>p1
$packed = pack 'V*', 1 .. 1e6;;
...
         Rate  unvec unpack
unvec  1.45/s     --   -45%
unpack 2.64/s    81%     --
  2. or download this
    use strict;

...
C:\test>junk0
Vector's size: 40000001 bytes
unpack vector in        362  secs...(Oh dear!!!)