User blog comment:PlantStarAlpineer0/Cobra Notation/@comment-33713741-20190106105547/@comment-35470197-20190106121333

According to GamesFan2000's blog, it is slower than his function, whose growth rate is approximately \(\omega\) or \(\omega+1\) in FGH. (I myself did not analyse the OP's function, because of this information of the upperbound. Therefore I do not know whether it is actually slower than it or not.)