help for map render delay in wpf version

[PongChen]

as you can see when i relocate the map center position（ this.MainMap.Position = new PointLatLng() {Lat= MainMap.Position .Lat+0.03,Lng= MainMap.Position .Lng+0.03};）

if i relocate the position frenquently ，the markers and map will cause a latency ，if lowly，it seems right，。
is there anybody had met the same problem？
prlease！

[PongChen]