I understand that nsgoyat said it is possible to use FastCGI using --wpfc, and then recommends installing REDIS on the server with "wo stack install --redis", and then installing the REDIS plugin.
How is the question in this scenario for multiple sites? Do I need to manually add the prefix? Since I'm not going to use --wpredis?
define ('WP_CACHE_KEY_SALT', 'mysite.com');
define ('WP_CACHE', true);