hmm, for the lag, u cna fix it, its caused by the ''white-ish'' effect it does when they get pushed. for the deeper thing, this isnt cuz of my trigger, but, u know the ShockWave effect, when u cast it, the ground is like going deeper, so maybe u can change the ability that is making the trigger run (to another Target Ground Ability, and u need to change the Ability Being cast is equal to and all the things that is saying Shockwave). Hope you know a lil bit about triggers.
For the lag, as i said, its caused by the effect behind the pushed units, so u can completly get ride of it, or u can change the pourcentage chances that the Special effect is appearing. if u still need problem cuz u understood fuck all of this, just re-message me.