Sort of for the the same reason it makes GPUs faster - parallelism. You can have multiple CPU cores. Or you can add parallelism to instruction handling by addin

Sort of for the the same reason it makes GPUs faster - parallelism. You can have multiple CPU cores. Or you can add parallelism to instruction handling by adding branch lookahead - where you basically execute a sequence of instructions in parallel. The deeper the lookahead, the more transistors (exponentially?) need to be added.