First, I see no reason to avoid strict and warnings. The only overhead it adds is the clearing of the variables in each loop pass.
No, it doesn't. Neither strict nor warnings makes that any variables are cleared. Variables may be cleared if you define them as lexicals inside a loop - but that doesn't change whether you have 'use strict; use warning;' in your program or not.

In reply to Re^2: Adding a lot of small integers by JavaFan
in thread Adding a lot of small integers by kappa

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