[OpenLayers-Users] OpenLayers Optimization - many vectors

[Paw3l]

Hi,

I am wondering if it is possible to optimize slightly my openlayers
application.

I have about 5000 objects of type Vector (all of which are in fact four
squared polygons). I was building all this list in this way:

<c:forEach var="outer" items="${requestScope.polygons}" >
        var polygon = new StringBuffer();
        polygon.append("POLYGON(")
        <c:forEach var="inner" items="${outer.points}">
                polygon.append(${inner.x}+ " " + ${inner.y} + ",")
        </c:forEach>
        polygon.buffer[polygon.buffer.length - 1] =
polygon.buffer[polygon.buffer.length - 1].substring(0,
polygon.buffer[polygon.buffer.length - 1].length - 1)
        polygon.append(")")
        var feature = new
OpenLayers.Feature.Vector(OpenLayers.Geometry.fromWKT(polygon), {name:
'${outer.number}'})
        feature.fid = '${outer.id}'

        vectors.addFeatures([feature])
</c:forEach>

As I said before there is a pretty large number of these polygons and every
operation takes many seconds (even the dragging the whole draw when I want
to see polygons that are outside of the current view).


I have tried to rewrite my code to use JSON:

OpenLayers.loadURL('http://localhost:8080/swanny/yard/gravesJSON', '', this,
allright, failure)

function allright(req) {
	g = new OpenLayers.Format.GeoJSON();
	vectors.addFeatures(g.read(req.responseText))
}

but it is even worse :( My openlayers map is loading very slow and every
action on it is very slow too.

Could anyone point me where could I look for some optimization information?
Or maybe someone knows the way I could do it? Google does not answer too
much...

Big thanks,
Pawel
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