what i'm saying is that classic shell loads a service of its own and the code to the menus is entirely new, its bloated compared to StartIsBack, but not a bloat itself.
I have an i7 with 32GB RAM so if it is adding any load I'm not noticing it, plus I'm not in the Start menu "that" much. But when I am, it's much preferred tot he Start Page especially search. I also like all the options. I'd rather have this than just the regular Windows 7 Start menu. I have not tried the others you mentioned and I'm sure they are fine, but this is just very well made, feature filled, and does what I want. No performance or bloat issues but like I said, I wouldn't notice any minor issues anyway.