Websites are advised to always use caching to speed up their site for users to improve user experience and have a boost in SEO, similarly with WordPress, there are plugins that help to speed up the site by performing caching on them when their Web hosts do not provide any form of caching or use CDN.
Vulnerability in WP Fastest Cache
If you are using WP Fastest Cache, make sure to update to 0.8.5.8 to prevent attackers using your site to direct all requests for css files, images, videos, etc. to their site, allowing them to serve malicious content to visitors of the vulnerable site and causing your site to be flagged by Google for being a malicious site.
About Jacy The Hosting Guy
Over at Jacy The Hosting Guy, besides make sure your web hosting needs are taken care of, your account also comes default with CDN (CloudFlare) and caching enabled to make sure your site is loaded quickly for your visitor no matter where they are.
Never be limited with my web hosting.
Free WordPress site transfers are included when signing up with Jacy The Hosting Guy.