Re^2: Problem with utf8 after nearly 4096 bytes

Your new version is still copying the entire file into mem. What you should try is changing your current approach:

undef $/;
my $bigfile = <$fh>;

# Do some processing on $bigfile
[download]

to something like this

while (my $line = <$fh>) {
    # Do some processing on $line
}
[download]

Cheers,
R.

Pereant, qui ante nos nostra dixerunt!

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