So I am looking to Minify CSS, but before enabling in ACP, I wanted to know what kind of edits I must perform on the backend? I read through this thread: http://xenforo.com/help/cache/ and it seems like I just have to add the 3 lines references, but what does caching xenforo sessions accomplish over regular caching? Pros? Cons? After enabling the Cache Front-End, do I also have to add the File Back-End code referenced in the guide?