The real answer is that every use() past the first is only a hash lookup

I said use Module qw( ); is just a hash lookup, but use Module; isn't. Are you contradicting that?

you ought to already know if you care about the overhead of each

How? I heard import can be fairly costly. But to know for sure, one would been benchmark it.

And whether or not he ought to know is not important. He asked so I answered.