Page Caching temporarily stores anything related to your website in a cache. When the visitor comes back to that page a while later all the data can be retrieved from that cache rather than requesting it from the server all over again. This saves time on getting the files the browser needs and means your website will load faster.
Image on request or lazy load means images are only loaded as the page is scrolled and would be visible to the user, which helps improve the load time of each page. Some of the biggest websites are using this technique now, including YouTube, Facebook and Yahoo.
One of the biggest incentives for purchasing WP Rocket is that it is constantly praised for being super easy to install. Whereas a lot of plug-in’s that promise to speed up your site would need a rocket scientist to install, most of the features are a simple one-click activation and as most websites will run perfectly with the preconfigured settings, it takes less than 3 minutes to install.
WP Rocket is one of the most effective ways to speed up your WordPress site, check out the website for more information on prices and features.