[development] 2k qps

[Moshe Weitzman]

> No one sugguested a Drupal performance tip. I will kick the ball off,
> it's a bit nuts, might break things but this is the devel list right ?
> I find many sites not using Drupal's aliases feature. If you are one
> of those, consider turning off aliases lookup. I do this quickly by
> adding return FALSE in first line in
> (http://api.drupal.org/api/4.7/function/drupal_lookup_path). This will
> save you some queries.

you save all those queries just by having an empty url_aliases table. no 
need to change code.