If a CPU is being cooled enough to not throttle, it is much more time and energy efficient to use all the cores you can rather than have another core run at a s

If a CPU is being cooled enough to not throttle, it is much more time and energy efficient to use all the cores you can rather than have another core run at a slightly higher frequency. Higher frequencies have diminishing returns and exponential heat loss. You might as well work-steal across machines at that point Shared memory is extremely fast, it crushes using local loopback networking, let alone using actual networking.