Sudden lag from glitched mobs, spawners

I made a 2 mob spawners. One of them has entity "Mob" in it and the other one has "Monster". I know those mobs were removed a long time, but I wanted to place them in my world for lulz. But after a while the mob spawners made Minecraft lag really badly and if I don't remove the spawners, the Launcher and Minecraft would just crash (Freeze). I have made a video of it. Haunted Mob Spawner in Minecraft?