Oh, okay, i stand corrected.
Well, the 3D high shockwaves are like, 80MB of data, and I think that it has to be copied from system memory to local VRAM, which causes the delay. I personally don't use 3D shockwaves or animated beams which really helps to keep the performance in line and It really doesn't look that much worse.
If the game ends up precaching the effect properly later, that would be cool. I wasn't aware it was a bug, i thought it was simply a limitation in the engine's effect loading system. After all, it wasn't designed for effects as large as the ones we have made for it.