Really annoying bug with SONA!

So basicly play a game with sona on summoners rift and q the first set of creeps either blue or red, or the first q onto champions and there will be a major FPS drop to 0 for a solid second. I joke with everyone like are you ready for the lag. And about 90% of the people say they lagged. So im assuming it has nothing to do with my computer which is btw an Asus Rog .i7 2k laptop with a gtx560m for a graphics card.