In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

Most devices which have multiple Vdd/Vss do so to reduce ground bounce. If only one were present, areas of the chip furthest way from the lines could experience current starvation at higher frequencies becuase they are the last in line, much like if you were at a potluck dinner with an entire football team in line in front of you, there may be no food left when it's your turn. This is an oversimplification of the situation, but it illustrates the point that each supply line should be connected to its own (but connected) path to the supply, and they should not be used as power routing, returning to the analogy this is equivalent to adding another football team after you without adding more food, needless to say they would be quite angry that nothing is left for them.

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