Messages error&info when login or register
You should know one important thing. wpForo has already built in cache system with Memory, Members, Object and HTML cache. This is the reason why all recommend exclude the base forum page. There is no mean to do a double cache on forum, it brings lots of conflicts, so you should disable other cache plugins for forum page.
There is no any cache plugin which can do a better cache for wpForo than the built-in wpForo cache system, because wpForo is not based on custom post types (all cache plugins are designed for WP custom post types). Instead of overloading wp_posts table and WordPress posts system wpForo comes with its own database tables and content processing functions for best performance reason.
wpForo CSS is already minified with one line er class. The JS code of wpForo is very light, it doesn't affect your forum loading speed.