[Issue 18388] std.experimental.logger slow performance

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18388

--- Comment #2 from anonymous4 <dfj1esp02 at sneakemail.com> ---
AFAIK, default logger implementations are simplistic and are not meant to be
very fast. Fast logging requires a bit of design and is supposed to be 3rd
party library, while std.experimental.logger provides a way to integrate it.

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