Perofrmance: PagePathCache is eating far too much memory

The "breadcrumb path" is cached by Jahia. I do not know how it is cached but one thing is sure: it is eating far too much memory (more than 200Mb on my 1GB VM = 20% of the heap). Moreover it does not look like being flushed by the softreference cache implementation. So perhaps it is still using some hard ref.

My stress test was quite basic: 20 users parsing the 5'000 first pages in live mode of a 30'000 pages site. Each LDAP user logins, parses the next 25 pages and logout. After 1'000+ users (25'000 pages displayed), I am running in a OOM situation. Such a cache definitviely eats all the memory.

So let's try to find a quick workaround for this cache for the SP3 release.