cocos2d/cocos2d-x — pull request #9567 by joewan (2014-12-20 16:31:04+00:00)
Title: fix ActionInterval serious performance problem.

this is a serious bug, it cause massive cpu consume.
if we have 1000 animate in active scene, this fix can reduce 5% performance, raise 70% perf locally!!!!!!!!!!!! .
because it have massive calls cocos2d::Vector constructor and de-constructor.
Vector's constructor will also call "addRefForAllObjects"!!!!!

This problem is very, very serious, and still has many similar errors in cocos2d-x.

we must use "auto&" sometimes, especially in update per frame.