Interaction to Next Paint (INP)

Interaction to Next Paint (INP) is a Core Web Vital metric introduced by Google to measure a webpage’s overall responsiveness to user interactions. While older metrics focused on how fast a page initially loaded, INP measures the delay between a user taking an action—such as clicking a button, tapping a screen, or pressing a key—and the browser actually providing the next visual update (the “paint”). If your INP score is high, the site feels “mushy” or unresponsive, which is a major trigger for “Session Abandonment.”

For Niagara business owners, a poor INP score is a silent conversion killer. Imagine pressing an elevator button and waiting three seconds for it to light up; you would likely assume it is broken. The same psychology applies to your website. If a customer clicks an “Add to Cart” or “Request Quote” button and nothing happens instantly, they lose trust and often hit the back button. High-end developers optimize INP by minimizing main-thread work and reducing complex JavaScript execution that “locks up” the browser during user interactions.

In 2025, Google uses INP as a primary signal for brand quality. A “Good” score (under 200 milliseconds) indicates a technically superior architecture that respects the user’s time. By prioritizing responsiveness, you are not just checking a box for SEO; you are removing the technical friction that stands between a visitor’s intent and your business’s revenue. INP is the ultimate measurement of how well your site handles high-concurrency traffic without degrading the user experience.