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> In the debug mode of my project, I did a lot log using print().
> There're many string concats and other calculation in the
> arguments of print func.
> In release mode, I assign the print to:
>   function dumb_print() end
> to hide the logs.
> But the arguments for print are still evaluated, is it possible
>  to avoid this overhead?

I guess, with something like

function do_something (f)
   print (f ())

-- Uncomment for release mode:
-- function do_something () end

do_something (function () return "Error: "..obj.get_error () end)

This technique will enlarge VM's code but execution-time will be minimal