Table of Contents
Pro feature. Errors Tracking is part of Opti-Behavior Pro. Start the 6-month free trial to unlock it.
Core Web Vitals are Google’s measures of page experience. Opti-Behavior measures them on your real visitors, per page and device.
| Metric | Measures | Good | Needs improvement | Poor |
|---|---|---|---|---|
| LCP – Largest Contentful Paint | Time to show the main content | < 2.5 s | 2.5–4 s | > 4 s |
| INP – Interaction to Next Paint | Delay between a tap/click and the screen reacting | ≤ 200 ms | 200–500 ms | > 500 ms |
| CLS – Cumulative Layout Shift | How much the layout jumps while loading | < 0.1 | 0.1–0.25 | > 0.25 |
How to improve them #
| Metric | Common fixes |
|---|---|
| LCP | Compress the hero image, preload it, use a cache and a CDN, reduce render-blocking CSS |
| INP | Remove heavy scripts, delay third-party widgets, avoid long tasks on click |
| CLS | Set width and height on images and embeds, reserve space for banners and ads |
INP needs real interactions: “No interaction captured” means no visitor clicked or tapped during the measurement.
Why lab tools and real visitors differ #
PageSpeed Insights tests one load from a data centre. Opti-Behavior measures your real visitors on their own phones and connections, so it shows problems that appear only on slow networks or older devices – and tells you which pages real visitors actually use.
Expected result #
You know which vital fails on which page and device.
