I don't know how to explain it, and I'm pretty sure linked list wasn't the right word. Pretty much getting O(1) complexity for optimal speed. It may help if I tell you I'm writing a tutorial on Vanilla Structs, and want the very best speed to show people.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.