jquery 성능 개선

http://codefactory.kr/2011/12/07/jquery-performance-tips-and-tricks/

https://raw.githubusercontent.com/atom/atom/master/spec/fixtures/git/repo-with-submodules/You-Dont-Need-jQuery/README.ko-KR.md

- 브라우저별 병목 확인

https://taegon.kim/archives/1310