In OpenLayers 2.12, only one tile was loaded per animation frame. This change brings back something similar as part of the tile manager. But we do not use requestAnimationFrame anymore, because @elemoine pointed out that browsers may give requestAnimationFrame invoked functions a higher priority than setTimeout invoked functions. The reason for this change is http://lists.osgeo.org/pipermail/openlayers-users/2013-April/028063.html.
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