they call it “owncloud infinite scale” but for some reason they don’t clearly specify that it’s designed for performance, and it has nothing to do with the previous version. They even start the introduction page with this:

Welcome to oCIS, the modern file-sync and share platform, which is based on our knowledge and experience with the PHP based ownCloud server.

If you read that a platform is based on their knowledge and experience with PHP, would you guess that they’re talking about a complete rewrite in go?