[development] Caching, caching, caching...

[Earl Miles]

Khalid B wrote:
> Regarding pre-caching of aliases, the problem is that this
> does not  scale. Up until 4.6 we read all the aliases in
> one query, and the expensive part was not the SQL
> query but the building  of the associative array for
> sites with a large number of aliases.

That's why my patch caches only a limited number of aliases, not the 
entire tree.