Sorry, doubling in 10 years vs doubling in 18 months effectively is plateauing! Especially since it isn't really a consistent 10% growth per year, but a decelerating growth over that decade. Furthermore, much of the purported single thread performance is taken from a small set of benchmark tests, and so chip makers just optimize them for those tests. Generic single thread performance has undoubtedly not doubled in that 10 years.
In any field of any kind except probably silicon, 100% growth in a decade would be marvelous. I don't think anyone could call it a plateau.
> Furthermore, much of the purported single thread performance is taken from a small set of benchmark tests, and so chip makers just optimize them for those tests
"Single thread" is a notoriously difficult benchmark to quantify. Instruction queue depth, floating vs integer, branching vs linear, there are so many variables.
Passmark is fine. Workload simulation is state of the art.