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If Perl's function calls are slow, the right response is to try to fix the implementation, not to try to avoid function calls.
As someone with more than a passing familiarity with the internals of Perl 5, do you consider it feasible* to substantially improve the current performance of function calls?
Update: *Given the nature of the forum, perhaps practical is a better word than feasible in this context.
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
The "good enough" maybe good enough for the now, and perfection maybe unobtainable, but that should not preclude us from striving for perfection, when time, circumstance or desire allow.