brendangregg.com
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Brendan Gregg's site is a comprehensive resource on systems performance engineering, offering tutorials, articles, and open-source tools for profiling, tracing, and analyzing performance (including flame graphs, perf, DTrace, and related techniques).
More resources on Performance Engineering
Brendan Gregg's Blog
Comprehensive perf tools and case studies
Systems Performance
Systems Performance - A book resource
web.dev
web.dev is Google's resource for building fast, accessible, and reliable websites, offering tutorials, best-practice articles, and practical tips. It covers web performance fundamentals, Core Web Vitals, optimization techniques, and auditing with tools like Lighthouse.
highscalability.com
High Scalability is a blog and resource hub that curates real-world case studies, architecture diagrams, and performance engineering guidance for building highly scalable web systems. It features in-depth articles on system design, scalability patterns, capacity planning, and optimization techniques from large-scale deployments.
Web Performance Tuning
Web Performance Tuning - A book resource