Cacio e Pepe is best when made fresh, not in large batches. The creamy sauce, made with Pecorino Romano, black pepper, and pasta water, is delicate. It needs to be prepared right away to get the silky texture it's known for. If you reheat Cacio e Pepe, the texture often suffers. The pasta can get too soft, and the sauce might separate or become lumpy.
However, key components can certainly be prepared in advance to significantly speed up service. You can pre-grate the Pecorino Romano cheese, pre-crack your black pepper, and have your pasta pre-portioned and ready to cook. This approach allows for efficient, quick preparation of a fresh, high-quality dish during busy periods without compromising its authentic taste and texture.