Why would the speed of the blog be a problem if it's behind a cache? Just ramp up the ttl entering varnish and purge aggressively on changes; hell, just reboot

Why would the speed of the blog be a problem if it's behind a cache? Just ramp up the ttl entering varnish and purge aggressively on changes; hell, just reboot varnish any time you make a change. Nothing about a cache interface is difficult to work around when your content changes as little as a blog would. If anything, moving to an unproven blog framework is going to cause much more headaches than a worpress blog slowing down for seconds every time you make a post.