[performance] add article on layout and web performance

Author: hshoff

README.md

@@ -1269,6 +1269,7 @@
 
 ## <a name='performance'>Performance</a>
 
+  - [On Layout & Web Performance](http://kellegous.com/j/2013/01/26/layout-performance/)
   - [String vs Array Concat](http://jsperf.com/string-vs-array-concat/2)
   - [Try/Catch Cost In a Loop](http://jsperf.com/try-catch-in-loop-cost)
   - [Bang Function](http://jsperf.com/bang-function)