Many processor designs can decrypt and execute encrypted data and system instructions. Processors encrypt answers. Is this CPU useful? How is this possible?

How can we avoid wasting processing cycles when a CPU is performing many instructions at once? What are the most significant aspects of this process? What effect do they have?

To what extent does a "reduced" instruction set impact the performance of a computer?

A processor can decode encrypted data and system instructions in a number of different ways, and it can also execute instructions based on data that has been decoded and system instructions that have already been performed in a number of different ways. The rebuttals that have been sent in will be encrypted before the processor reads them. Is there any benefit to use a CPU in such a manner if at all possible? What are the system requirements, and how do they compare to the system's performance and efficiency?