[GAMEPLAY] Placing a ward causes framerate pause

I am encountering an issue where a .5-1 second pause occurs when a ward is placed nearby. It does not always occur but it often happens multiple times per game.

1. Place a ward

In the following video, you can see the pauses that occur when I place a ward as Leona and when Ezreal places a ward. My ping was bouncing around a little bit that game, but this issue manifests itself during games where my ping is consistent as well. Also, the pause is fairly mild in this example. It is sometimes nearly twice as long. http://youtu.be/13NFPGsJc1o

Any help you can provide to rectify this issue would be greatly appreciated.