I have updated Wordfence to the 5.0.1 version with the Falcon Engine caching.
However I don't see any performance speed improvements in Google PageSpeed and GTmetrix.
With my WP Fastest Cache plugin I can get a 90% score in Google Page Speed and a 94% score on GTmetrix.com.
When I disable my caching plugin and only activate the Falcon Engine caching system the best score I get on Google PageSpeed is 74% and on GTmetrix I get 75% only.
Are you seeing any speed / performance improvements on your website?!