It highly depends on your specific workload, but freeing up RAM by paging out rarely or downright unused pages to swap can definitely give a performance advanta

It highly depends on your specific workload, but freeing up RAM by paging out rarely or downright unused pages to swap can definitely give a performance advantage. In consequence, I always give swap. Even on the off-chance it ends up unused, disk space is orders of magnitude cheaper than RAM, so I don't mind sacrificing it for potential gains.