A caching plugin will often provide more speed with Savvii. This is done by combining and minifying CSS and JS files, by enlisting memcached functionality on our VPSes, or by simply caching pages when our Varnish caching is unable to do so.
At this moment we recommend WP Rocket as a caching plugin. It is simple to use, and it provides great results. WP Rocket also immediately flushes the Savvii cache when needed. WP rocket is a paid plugin.
If you are looking for a free alternative to WP Rocket, you should take a look at W3 Total Cache. W3 Total Cache has many different options and settings, which makes it quite complicated in its use. If you want to learn how to configure W3TC, you should check our blogpost.
If you have any questions on the matter, or need additional help configuring W3TC - feel free to contact us.