FlexiStatic

Performance is most important for the first post/page that a visitor of
your blog will request. Usually if the vistor like what he see the next
pages are not so critical. But the nature of static sites implies that
any dynamic elements of your install that reply upon WordPress plugins
or internal functions to operate dynamically will no longer work. So
why do you want lost all the benefit from dynamic elements like
captchas when making all the post/pages static? Chose only the landing
pages and let the other posts work as prior.

FlexiStatic create real static html-sites. So you can also give the blog
page (start page) a performance boost whatever do you still use WP static
page option.