on drag, it only redraws after the drag ends

[Frazer]

for example: if we have data off the left of the screen and we grab the map on the left and drag the whole way to the right, it will look blank until the drag is released

[Frazer]

can be fixed by:

getEvents: function () {
var events = {
resize: this._onLayerDidResize,
moveend: this._onLayerDidMove,
move: this._onLayerDidMove
};
.....

Performance seems ok