use and require do different things, so there really is no comparison here. use is a compile-time directive, while require is a run-time directive (happens after the script starts executing).

In addition, use Foo imports all of the symbols (variables, subroutines, etc.) that the module exports, while require doesn't.

I doubt there's that much of a speed difference when you add in the code that would make the second method do what the first does. The first is also *way* easier to maintain.

Your best optimizations in this area come with using only the modules you *need* and importing only the symbols you *need*.

HTH!

perl -e 'print "How sweet does a rose smell? "; chomp $n = <STDIN>; $r
+ose = "smells sweet to degree $n"; *other_name = *rose; print "$other
+_name\n"'
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