This is the classic Sutherland "wheel of reincarnation" cycle -- a function (commonly graphics acceleration or network connectivity) will be provided by the CPU

This is the classic Sutherland "wheel of reincarnation" cycle -- a function (commonly graphics acceleration or network connectivity) will be provided by the CPU, which is found to be a bottleneck so the function is offloaded to a dedicated device, which then becomes a bottleneck as the CPU receives more dedicated focus on performance improvement than some bespoke, single-purpose offload engine.