Turf Takeover lag when playing Local splitscreen coop.

Every single time my daughter & I play split screen on every game turf takeover, ops, weekly challenge game, gnome bomb all other games available with split screen against co-OP other internet  players.   Our characters ate in complete lag they move like 1 inch at a time it's completely glitchy but only in split screen co-OP against other internet players.  It's unplayable please respond & fix this.   This is the only reason I bought this game for my daughter to play with me split screen.