Javascript of FireFox 49 runs more slowly than FireFox 37 about 2 - 3 times
Hi all,
I have a problem about performance of java-script of FF 49. I run same a java-script source code on a same Windows machine. However, FF 49 runs more slowly than FF 37 about 2-3 times although my source code uses basic java-script APIs.
Environment:
+ Windows version: ++ Windows 7 Enterprise 64 bit
+ Firefox version: ++ Firefox 37.0b7 ++ Firefox 49.0.2
+ Test page: https://www.amazon.com/R-J-Enterprises-DC-0-RD-Covers-Price/dp/B002N73Y4W/ref=sr_1_6?ie=UTF8&qid=1430145955&sr=8-6&keywords=rj45+jack+dust+cover
+ Java-script Source code :
var nTotal = 0; var dBegin = new Date(); var list = document.getElementsByTagName('div'); var dBegin = new Date(); for( var nTimes = 0 ; nTimes < 1 ; nTimes++){ for(var i = 0 ; i < list.length ; i++){ var element = list[i]; do{ nTotal++; element = element.parentNode; }while(element != undefined && element != null ); } } var dEnd = new Date(); console.log("[" + Math.abs(dEnd - dBegin) +"] : Number of div " + list.length + " ; total element = " + nTotal);
I also attach my result. Could you refer them for more details.
I have researched on google but not found any useful information about my issue. Could you help to support me about this issue? It is so urgent!
Thanks in advance!
Tan