Tales of the unexpected - troubleshooting WordPress at scale

What happens when a WordPress site goes viral and is suddenly is receiving over 100,000 requests a second? Rick has spent years supporting, tuning and troubleshooting some of the world's largest and most high-profile WordPress sites, and the causes are rarely what you'd expect. This talk digs into how to optimise a site for high traffic: the failure points that come up again and again, plugins and custom theme code that don't work at scale, the diagnostic approaches that actually work under pressure, and the workarounds worth knowing about. Lessons that apply whether your site serves millions of visitors or a few hundred.