Rudder

When correcting #2826 (cf: commit ddb9c4efefe1b7cb4d36c2d0010dde2b92ef86de), some "lazy val" were introduced in place of the old "val".

The reason if that it seems to be faster that way.

So, we have to:

- check if there is an actual semantic difference between the two;
- if not, try to assess what is the faster in Rudder way of using them;
- if we can't assess that, decide for a policy to use, and use it everywhere.