[svg-developers] Performance differences : IE/ASV3 and Op9 vs FF2.0

[simonshutter]

I have to change the attributes of a large number of elements.  I use 
the code below:

var i=0;
var elm;
var r=document.getElementById('test');
var colR=r.getElementsByTagNameNS('http://www.w3.org/2000/svg', 'rect');
while(elm=colR.item(i++)){
    elm.setAttributeNS(null,'y',elm.getAttributeNS
('http://www.schemax.com/r','y2'));
}

IE/ASV3 and Op9 appear to perform the changes equally well but FF is 
considerably slower.  For example to change the attributes of 500 
elements:

IE/ASV3 and Op9 = 15 msec
FF2 = 115682 msec

Any ideas?  Am I using the while loop inappropriately?

Thanks, Simon





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