> It goes without saying that you should measure before you go too
> far with this. In Squeak, you can use:
>   "TimeProfileBrowser onBlock: [somethingToProfile]"
>
> If you decide that primitives would help, you can implement them
> as pluggable primitives in Squeak. Load VMMaker from SqueakMap to
> get started.
>
> Give it a try. If your primitives turn out to be useful, you can
> post your plugin on SqueakMap so others can make use of them. If
> they are useful to lots of folks, the various VM builders may
> want to start distributing them.
>
> If you do write primitives for numerical methods, you need to give
> some thought to making them work on both 64 bit and 32 bit Squeak
> platforms.  Almost all Squeakers are using 32 bit Squeak right
> now, but a numerical plugin that did not handle 64 bits gracefully
> would not be appreciated by the VM builders. The page is a bit
> out of date, but you can see what's involved by reading this:
>  <http://squeakvm.org/squeak64/>
>
> Dave

Thanks for advice. I do not want to write this primitive by now.
I will use/implement the messages #sum #sumOf: etc... because they are usefull 
to me, even not optimized.
I am just asking if they are good candidates to be in the base image or not.
The fact that some could be optimized is just an argument, not an intention.