[OpenLayers-Users] Slow marker rendering in IE

[Jani Patokallio]

Greetings,

Ivan Grcic wrote:
> Hi, no matter what u do showing 1000features in IE will be sloooow!
> I suggest to try using cluster strategy!
>   
Any suggestions for a clustering algorithm that works on markers? 
OpenLayers.Strategy.Cluster seems to cover Vector features only.

Cheers,
-jani

> On Tue, Dec 2, 2008 at 5:26 PM, Jani Patokallio <jpatokal at iki.fi> wrote:
>   
>> Greetings,
>>
>> I have an OpenLayers-based site (http://openflights.org) that renders
>> airport markers and flight vectors on a world map, and while it's
>> reasonably snappy on Firefox, it's very slow on IE.  I've turned off the
>> alpha hack, but this did not seem to make any difference at all.
>>
>> Searching through the archives, there was a mail (*) that suggested
>> that, instead of using a separate mousedown event handler for each
>> marker (which is what I'm doing right now), you should "replace it with
>> an event handler on the container and then using the target property to
>> determine if one of the smaller elements had been clicked".  If the
>> container of a Marker is its Layer.Markers, how do I set an event
>> handler on it and determine the target?
>>
>> * http://www.mail-archive.com/dev@openlayers.org/msg00084.html
>>
>> Also, ideas for how to speed up rendering at the world level, when there
>> may be >1000 airports on the map, are welcome.  My current thinking is
>> to load all markers into the layer, but listen to the map's zoom events
>> and call marker.display(true/false) to toggle them on/off when zooming
>> in/out.  There are no faster-rendering clickable alternatives to PNG
>> icons, right?
>>
>> Cheers,
>> -jani
>>
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