My site uses subdomains and multsite structure. The joomla system cache plugin has issues with caching multisite using subdomains. Page Cache caches the URL not including the domain so a homepage loaded for one site will get displayed for another.
Need to build another page cache plugin (or modify the existing system-cache plugin) and intercept and extend the JCachePage class to make the cache id include the domain name. So when system cache (page cache)turned on, the homepage of a subdomain will load for the right sub-site.
