Question

How much faster are registers than RAM?

Answer 1

CPU register is always faster than the L1 cache. ... Something that was automatic for a while, shrinking the feature size on the chip automatically produced a faster processor. The register file in a processor is small and sits physically close to the execution engine. The furthest removed from the processor is the RAM.

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Answer 2

The compiler decides what variables should be in registers and when. Registers are essentially internal CPU memory. So accesses to registers are easier and quicker than any other kind of memory accesses.
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