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// Empty an Array http://davidwalsh.name/empty-array
myArray = []; // bad
myArray.length = 0; // good!

//http://www.w3schools.com/js/js_performance.asp
//bad
for (i = 0; i < arr.length; i++) {} 

//good
var l = arr.length;
for (i = 0; i < l; i++) {}

/*
Writing Fast, Memory-Efficient JavaScript
https://www.smashingmagazine.com/2012/11/writing-fast-memory-efficient-javascript/
*/

/*
10 Javascript Performance Boosting Tips from Nicholas Zakas
http://jonraasch.com/blog/10-javascript-performance-boosting-tips-from-nicholas-zakas
*/