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Re:UI Performance Decline – OS X Tiger to Yosemite [video] by chrisdroukas on Wednesday December 24, 2014 @01:09PM (#8793816)
No. Apple provides security updates for several versions. They most recently patched NTP for Mountain Lion, Mavericks and Yosemite at the same time.

http://support.apple.com/en-us/HT1222

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