Core Web Vitals: Lessons learned over years of Backend and Frontend Performance analysis

Over the past several years I've been working with my team to improve Core Web Vitals on www.renesas.com, digging deep into Backend and Frontend performance. Along the way I've made many discoveries that I wish I had known earlier, many of which may be relevant to your site too. I'll share as many of these treasures as I can across a variety of performance topics, including:

• Mobile INP: How to find and fix mobile INP issues. How does Google Tag Manager destroy mobile INP?
• CLS: How to find and fix layout shifts
• LCP: How to reduce render-blocking CSS
• New Relic PageViewTiming: How to customize and analyze New Relic RUM data
• Drupal backend optimization: how to use New Relic and Blackfire to prioritize the right code optimizations
• Drupal caching: How to analyze cache tag use and invalidation in New Relic and how to take full control of your cache tags and invalidation logic
• CDN caching: How to optimize your CDN cache hit rate
• Browser caching: How Drupal plus Google Analytics can lead to no HTML browser caching
• CDN caching for authenticated users: How we did the seemingly impossible and made our site cacheable in CDN for sessioned requests
• Tracking metrics to catch performance regressions