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Andrew Thompson authored
Originally an idea that Dizzy forwarded to me from Tony Rogvall. Basicially all the work lager does gathering metadata and stuff is wrapped in a case statement that fails-fast if the message is definitely not going to be logged; the severity isn't currently being consumed and there's no traces installed. In my simple test, logging 1 million debug messages, when the debug level is not being consumed, goes from taking 2.99 seconds to 1.21 seconds with this change. Also, lager pre 1.0 actually had something similar to this, but it was removed during a refactor and never re-added.
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