[OpenLayers-Users] icreasing time loading images

[aniss kabbaj]

I'm using openlayers
i try to display 12 images (png), it works but takes too much time to load 
(12 images = 1go)
is there any solution to decrease time loading my images.
i load only a small part of the 12 images wich interest me  : with

var PointZoom = new OpenLayers.LonLat(pointX,pointY);
    map.setCenter(PointZoom, 5);

thanx for helping me

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