You can try accessing the dictionary file directly using the Search::Dict core module, assuming your dictionary is sorted. It performs a binary search through the file. Here, I've wrapped its functionality into an OO-module for convenience:
use Data::Dumper;
use Search::Dict::Object;

my $d = Search::Dict::Object->new(
    file => "/tmp/dict.txt",
    keyval_xfrm => sub { split /\t/ },
    comp => sub { $_[0] cmp $_[1] }, # should correspond to file sort 
+order
);

print Dumper {
    aaa => $d->get('aaa'),
    foo => $d->get('foo'),
    bar => $d->get('bar'),
    baz => $d->get('baz'),
    zzz => $d->get('zzz'),
};

__END__
$VAR1 = {
          'bar' => '789',
          'baz' => '456',
          'aaa' => undef,
          'foo' => '123',
          'zzz' => undef
        };

[download]

The dictionary file:
$ cat /tmp/dict.txt
aho    234
bar    789
bat    567
baz    456
cut    678
foo    123
yyy    000

[download]

The Search::Dict::Object package:
package Search::Dict::Object;

use warnings;
use strict;

use Search::Dict ();

sub new {
    my $class = shift;
    my $self = bless { }, $class;
    $self->_init(@_);
    return $self;
}

sub _init {
    my $self = shift;
    %{ $self } = @_;

    unless (defined($self->{FH}))
    {
        my $file = $self->{file} || "<unspecified file>";
        open($self->{FH}, "<", $file)
          or die("Cannot open: $file", "\n  ", $!);
    }
}

sub get {
    my ($self, $key) = @_;
    return undef unless defined($key);

    my $FH = $self->{FH};
    my $comp = $self->{comp} || sub { $_[0] cmp $_[1] };
    my $keyval_xfrm = $self->{keyval_xfrm} || sub { $_ => $_ };
    my $opts = {
        comp => $comp,
        $self->{keyval_xfrm}
          ? (xfrm => sub { chomp($_[0]); (map $keyval_xfrm->(), $_[0])
+[0] })
          : (),
    };

    if (Search::Dict::look($FH, $key, $opts) != -1)
    {
        my $entry = <$FH>;
        return undef unless defined($entry);

        chomp($entry);
        my ($k, $v) = map $keyval_xfrm->(), $entry;
        return $v if $comp->($k, $key) == 0;
    }

    return undef;
}

sub DESTROY {
    my $self = shift;
    close($self->{FH}) if $self->{FH};
}

1;

[download]

In reply to Re: tying a hash from a big dictionary by repellent
in thread tying a hash from a big dictionary by Anonymous Monk

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