LMB tend to hit pellets quick, and sometimes there's a splash, other times it's like upward surge of water without a splash. However, I never see them eat the pellets slowly.

Now, most all the Channel Cats and Blue Cats that I've seen hit the larger feed don't hit it fast. Sure, some are quicker than others, but some also just vacuum at the surface.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."