[OpenLayers-Users] Limit on number of markers in a browser

[James]

http://trac.osgeo.org/openlayers/wiki/FrequentlyAskedQuestions#WhyisMyMapSluggishwhenIAdd500Markers

Does anyone have ball-park fiqures for how many markers later versions 
of IE support?

Or ideally, is there a way to determine in JavaScript what the limit is?

Thanks,
James

ps. The links in the question below (Why don't my markers appear at 
certain zoom levels?) are broken, where should that be reported?
<http://trac.osgeo.org/openlayers/wiki/FrequentlyAskedQuestions#Whydontmymarkersappearatcertainzoomlevels> 

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