So I summoned a Bat with the arguments

{Silent:1,ActiveEffects:[

{Id:14,Amplifier:1,Duration:99999,ShowParticles:0}

]}

It summoned an invisible Bat like it should. But I could see the potion particles following him when I specifically specified no particles.

I saw a tweet from Dinnerbone saying he changed particles so that they don't hog as much CPU. (Does that mean they are no longer entities?) I assume my problem has to do with the fact that particles no longer operate under the same parameters.