Improvements
Compatible non-blocking requests.
Extended checking that file is not found.
Fast content optimization in temporary cache.
NGINX cache clearing method.
Processing disabled 'If-Modified-Since' request for images alternative redirection.
Support for 'WP Hide & Security Enhancer' plugin.
Fixes
Possible indexing of internal requests.
Warning about lazy loading for JetPack of 13.4.2 version and higher.