Quoting from PerlMonks: The difference between my and local,
But in real life, they work virtually the same? Yes. Sort of. So when should you use them?
Use my when you can (it's faster than local) ...
I know the lexical vs dynamic scoping difference between my and local, as discussed in this SO thread, but I am not sure why my is "faster".
What exactly do we mean when we say that a my variable is faster than a local variable in Perl?