I've seen a number of benchmarks for warnings, and there never was a run-time penalty. 

       Rate w=1 w=0
w=1 3003/ms  -- -1%
w=0 3032/ms  1%  --

       Rate w=1 w=0
w=1 3002/ms  -- -0%
w=0 3010/ms  0%  --

[download]

Benchmark code

I'm curious as to why you said compile-time. Some strict checks are done at run-time. But again, there's no penalty for strict either. 

        Rate sr=0 sr=1
sr=0 2751/ms   --  -0%
sr=1 2759/ms   0%   --

        Rate sr=1 sr=0
sr=1 2735/ms   --  -1%
sr=0 2754/ms   1%   --

[download]

Benchmark code

In reply to Re^2: anyway to abbreviate use strict; use warnings; by ikegami
in thread anyway to abbreviate use strict; use warnings; by metaperl

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