Comment 3 for bug 832061

We have may constants that have been established as being the "best" value based on experiments on a finite set of setups (branch history, number of files, number of directories, whatever). This best value is therefore not the best one for some setups.

Requiring the user to look (or modify) the source code forbids experimentation for values best suited for a particular setup. I.e. even if bzr can perform better in some cases, nobody can try better values.