Try 
while (my $line = <MYINPUTFILE>){
...
}

[download]
foreach $line (@lines){
...
}

[download]
is probably trying to read the whole file into @lines and _then_ loop over it. The while will read one line at a time.

Update
Better, check that $h[3] and $h[4] actually contain what you think they do.

In reply to Re: Reading 60k lines in file by wfsp
in thread Reading 60k lines in file by b_gsmls

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