[Zope] Updating Caches

I've got a site that I've spent some time on optimizing. I have used both Ram caches and a proxy cache (in front of the site). My problem is that the site is not accessed very often. As a result, the caches are often empty when somebody happens to hit the site and then they pay the cost of filling the caches. How do people normally handle this? Is it possible to some how "schedule" a request in Zope to make sure that the caches are always filled? In order to fill the proxy server caches, I suppose the request has to originate from outside of Zope? Anyway, I'd be interested in hearing if other people have these kinds of issues and what they do about them. Thanks. -- Mike