On 1 of my stereo PCB's, they have the audio GND and power GND pins (of the speaker driver chips) soldered onto the same big solid GND plane, but they also put some little SMD cap across the pins too, with added pads.
So shorting a cap with a wire, for some higher frequency, the wire's parasitic's might be more of an impedance than those of the cap. So why short a cap on purpose?? Or I'm thinking backwards, is it too prevent a dramatic change in voltage between the 2 points, in a short amount of time, by adding a large enough capacitance ?