Similar in speed, but much larger (CFC) than a plate chiller. My 40 plate chiller is about the size of a brick. A CFC will be the size of the copper coil inside it, plus the hose outside it, plus fittings. I can store my plate chiller in the toolbox that holds my march pump, when not in use. I use the same type of hose/tubing that I use on the pump, to recirculate the mash (and then run the hot wort through to sanitize the chiller) so that doesn't take up any more space. With QD's on the wort side, it makes connecting it up a snap.
Had I known about the way a plate chiller works, and how much better it is compared with an IC, months ago, I would have saved a lot of money, and time, building IC's. I probably would have spent the same amount on the plate chiller that I spent on hardware to make the IC's... DOH!!