While I'm an sure there can be cases where it reduces CPU bottlenecks I can't see this being universally so.Where did this idea of inserting fake frames will reduce cpu bottlenecks come from ?
The real frame rate should remain mostly the same.
Basically, where the rendering threads are very CPU intensive (maybe doing the kind of work for RT which really will eventually be offloaded to the GPU - in something similar to GPUs before T&L became standard).
While other threads are not.
Anything more complex, I can't see how inserting extra fake frames can help.