Lag When I die

Nearly every time I die on any game mode, my fps drops.
Usually, Minecraft runs at 60 fps, but drops below 30 when I die occasionally.
Restarting the world I was playing or Minecraft itself usually fixes it, but it's annoying.
It has affected me since I bought the game, which was when it was in 1.8.4.
It might be something to do with my game only, because nobody else seems to get this bug.