Demystifying INP: New tools and actionable insights

What this post added

This post introduces the `await-interaction-response` module, a new library designed to help developers split user interaction acknowledgment from expensive DOM updates. It provides a practical solution for scenarios where immediate rendering is not feasible, thereby improving perceived performance and INP scores. The post also elaborates on the intricacies of the INP metric, offering deeper insights into its phases and common pitfalls, and provides actionable advice on optimizing event handlers and browser rendering, including techniques like CSS containment and DOM invalidation minimization.