Issue #14920 has been reported by rafaelfranca (Rafael Frana).

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Bug #14920: Backport r63857 to fix performance problem on Time class in MacOs systems
https://bugs.ruby-lang.org/issues/14920

* Author: rafaelfranca (Rafael Frana)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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Related to https://bugs.ruby-lang.org/issues/14435.

Both 2.4 and 2.5 are affected by this issue. Naruse-san commit fix it by not calling tzset() more than once when we know the year doesn't have leap seconds. 





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