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New Shaves a second off
Not consistently though.
Thanks.
New The fastest way to pull the file in
To get a baseline on how quickly you can get the entire file into memory, something like
\nmy $contents;\nsysopen(F, "somefile.dat");\nsysread(F, $contents, -s F);\nclose(F);\n

is about as fast as you can go in Perl. But that might not help if you need to slice the file into pieces for processing, since the pieces will need yet more memory.
     Hey Ben - Perl memory / performance research - (broomberg) - (5)
         I wouldn't expect them to allow you to save space - (jake123)
         Array vs. Hash performance - (dws) - (2)
             Shaves a second off - (broomberg) - (1)
                 The fastest way to pull the file in - (dws)
         Sorry for not responding, I've been on vacation - (ben_tilly)

You know the French. The problem with them is that they have no word for entrepreneur.
80 ms