Adobe Tech Notes are helpful pages that give information on known issues and things system requirements. One very recent one of interest to most Lightroom users is the new Performance Hints technote.
Advice on RAM, Catalog Location, Displays and order of Developing are among the topics covered. In short, it’s a good read for any Lightroom user.
It's interesting to see the recommended order, because I've always said to do spotting, then Lens Corrections, and this technotes bears it out.