Riding a horse causes severe lag and crash

I can only ride my horse for a short distance before the game lags severely, not loading chunks and not recognizing mobs or blocks, as well as not allowing user to get off of the horse. (Only shows the player crouching while still on the horse when LShift is pushed.) It is also impossible to move, you can only look around you. The game has even crashed a few times because of this. Tried restarting my computer, as well as the game- the problem still persists.