You've already gotten the best suggestions, so here's some minor ones: Replace 
        if (($TotalNets == 50000) || ($TotalNets == 100000) || ($Total
+Nets == 250000) || ($TotalNets == 500000) || ($TotalNets == 1000000) 
+|| ($TotalNets == 1500000) || ($TotalNets == 2000000) || ($TotalNets 
+== 3000000)) {

[download]
with a hash (e.g. %Nets) containing the above values and 
        if ( $Nets{$TotalNets) ) {

[download]
I like pc88mxer suggestion, but I notice that (for example) 150,000 is not in your test, so modulo 50,000 would give you a false positive.

Another suggestion would be to replace 

            $_ =~ s/^ *//;
            $_ =~ s/ *$//;
            @DriverLine = split (/\s+/,$_);

[download]
with 
       @DriverLine = split( /\s+/, 
                            (( /^\s*(\S.*)\s*$/ ) ? $1 : $_ ) );

[download]

The code hasn't been tested, and I can't swear to the efficiencies.

In reply to Re: Looking for ways to speed up the parsing of a file... by apl
in thread Looking for ways to speed up the parsing of a file... by fiddler42

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