I'm a long time Y'z Dock user. Since it's no longer being worked on I decided to give RK Dock a shot. The features and options are great. I love everything about it EXCEPT the "smoothness" of the magnifying icons.
Are you using the latest version of RK (0.4 beta build 134)? The earlier version was kinda choppy, but I find the latest version to be just as smooth as yz. cpu utilization is identical for both too, so you shouldn't see any more choppiness with RK than yz on a slower computer.
The only time I notice RK getting unresponsive is if any other processes are using the CPU. For example, run something like LAME compressing an mp3, and notice how you can't use the dock at all until the mp3 is finished compressing. It just freezes... but when its responding, it looks just as smooth as yz.
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