Harry Roberts led an excellent five part Smashing Magazine workshop on web performance. We learned about running the perfect web page speed test, how to read a waterfall, tips and tricks to improve, and measure, performance optimizations. I thoroughly enjoyed the class and have many take aways already implemented on live sites.
Front-End Web Performance Masterclass takes you on a voyage, starting on the server and making our way to the user, looking at what parts of the journey can slow us down, and what we can do to mitigate them. CDN configurations, TLS performance, protocols, network utilisation, resource scheduling, critical path optimization, asset delivery and optimization, CSS performance, runtime and rendering, caching, and a whole lot more. A lot, lot more.