A Primer on Scaling WordPress Sites from WordPress at Scale
If you’ve ever needed to scale a WordPress site and not known how, here’s a website that will at least explain your ignorance to you, if not actually remove it all at once.
WordPress at Scale is all about WordPress scalability, and includes really helpful introductions to topics like elastic architecture, page and object caching, and query performance. This site’s sponsored by Pantheon, but is absent sales pitches and affiliate links—it seems to simply be an informational resource. Enjoy!