1. Xcache. If I have this on the server, which I do, must I incorporate the lines mentioned here in order for xenforo to take advantage of the caching? My sense is that the answer is "no" because, frankly, I've noticed no difference with simply xcache working and with xcache working and those lines inserted. What say ye?
2. Minify CSS. Does this actually have a performance impact for the better if turned on? I haven't noticed anything.
3. Fetch public templates as files. Same as question 2.
With xcache installed, should I just go ahead and "minify" and "fetch"?