Even better than the other packs
KriptoFX produces some of the most spectacular particle effects you can find on the asset store. There's a lot of attention to detail here. With that level of artistry comes complexity.
Much of what you see is tweak-able, but the components themselves are quite complex, moreso in Pack 4 than in the others. You can find animators in many effects, and each effect is often composed of decals, projectile particles, projectile meshes, explosion particles, dynamic lights, and a variety of movement components that drive effect motion. This will cause a load on your rendering, but you can often remove one or two of these to achieve a great performance and still maintain the integrity of the effect.