( I can't take all credit for this, I first saw it demonstrated by someone on perlmonks, but I don't recall where or what the name was )

Consider: 
%dispatch = (
foo => \&foo,
bar => \&bar,
baz => \&baz,
qux => \&qux,
);

sub foo {}
sub bar {}
sub baz {}
sub qux {}

if( exists $dispatch{ $method } )
{
  $dispatch{$method}->();
}

[download]
Versus 
package dispatch;
sub foo {}
sub bar {}
sub baz {}
sub qux {}

package main;
if( my $ref = dispatch->can($method) )
{
  $ref->();
}

[download]

In reply to Automating dispatch tables by BUU

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