Cloudflare

It basically caches your website to it's large Content Delivery Network (CDN) which means, that your users will receive your websites content faster, as the data have to travel a shorter distance between the user and the server.
CloudFlare also offer image optimization such as Brotli, but also JS optimization called RocketLoader. But you are also able to minify HTML, CSS and JavaScript.

Oh, and you are able to receive free SSL certificates, generate an Origin certificate. You are able to enable proxies for your webserver for more security.

BUT; you must need to change your DNS, according to what CloudFlare asks you to do, changing nameservers.