Issue #14920 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 2.3: REQUIRED, 2.4: DONE, 2.5: DONE to 2.3: REQUIRED, 2.4: REQUIRED, 2.5: REQUIRED

Hi rafaelfranca,
Thank you for your notification.
I overlooked your comment when I backported r63994.

r63857,  r63858 (and r63864 for naming convention) could affect the performance of Time.now.
I reset Backport field to express your request.
We will discuss about the side effect of these changesets.

Regards,

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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#change-74404

* Author: rafaelfranca (Rafael Frana)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.3: REQUIRED, 2.4: REQUIRED, 2.5: REQUIRED
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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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