Make sure ash does not affect on speed too much

[Vasyl Zuzyak]

• http://www.slideshare.net/madrobby/extreme-javascript-performance
• http://www.sitepoint.com/discovering-the-high-resolution-time-api/ , http://msdn.microsoft.com/en-us/library/ie/hh772738(v=vs.85).aspx (Internet Explorer 10+)
• prefer plain loops instead of forEach/map/reduce
• http://www.opennet.ru/opennews/art.shtml?num=40076
• http://habrahabr.ru/post/247857/
• http://blog.scottlogic.com/2010/10/15/javascript-array-performance.html
• https://github.com/babel/babel/issues/1176