Hi Marko,
using a custom sitemap would mean we can’t preload all other pages. Besides, I need to make sure that those pages are rebuilt at specific times under specific conditions.
I already found a solution. We essentially use wget to load those pages after our own cache has been created. This little trick saved us about 50% CPU load.
You might want to add features to W3TC to manage pages that require lots of CPU power to be created but only have to be updated once a day or so. Caching seems to be the natural solution to this problem. I guess we are not the only ones having this problem.
Thanks for your help!
Michael