Script Params vs Constant Hash in Script

I need to translate from one set of values to another. I would use the translate filter plugin but I need to keep the original value if no translation is found instead of nil.
So my code is:

"foo" => "bar",
"dead" => "beef",

def filter(event)

My question is whether it is more efficient with respect to memory, performance, etc. to do it like this or perhaps to pass the map as a script_params value because I don't know if TRANSLATE_MAP is created once or every time script is called. Similarly for script_params.

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