You can do either but a refernce is more efficient:

Maybe I should use a reference as you suggest now Iam using ...

MyModule::function(%person)

and in my function :
my %person = @_;

For now I don't think I have an performance issue, - but ofcourse for now I have 2 copies.

2 copies is twtice the memory :) plus its more maintainable and expandable.

Any drawbacks if I try some kind of asyncrhonous call if possbile ??.

Can you give us some code of what you mean by "asyncronouse call"?

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