Safari 26.2 adds support for measuring Largest Contentful Paint (LCP) and the Event Timing API, which is used to calculate Interaction to Next Paint (INP). This enables site owners to collect Largest Contentful Paint (LCP) and Interaction to Next Paint (INP) data from Safari users through the browser Performance API using their own analytics and real user monitoring tools.
LCP And INP In Apple Safari Browser
LCP is a Core Web Vital and a ranking signal. Interaction To Next Paint (INP), also a Core Web Vitals metric, measures how quickly your website responds to user interactions. Native Safari browser support enables accurate measurement, which closes a long-standing blind spot for performance diagnostics of site visitors using Apple devices.
INP is a particularly critical measurement because it reports on the total time between a user’s action (click, tap, or key press) and the visual update on the screen. It tracks the slowest interaction observed during a user’s visit. INP is important because it enables site owners to know if the page feels “frozen” or laggy for site visitors. Fast INP scores translate to a positive user experience for site visitors who are interacting with the website.
This change will have no effect on public tools like PageSpeed Insights and CrUX data because they are Chrome-based.
However, Safari site visitors can now be included in field performance data where site owners have configured measurement, such as in Google Analytics or other performance monitoring platforms.
The following analytics packages can now be configured to surface these metrics from Safari browser site visitors:
- Google Analytics (GA4, via Web Vitals or custom event collection)
- Adobe Analytics
- Matomo
- Amplitude (with performance instrumentation)
- Mixpanel (with custom event pipelines)
- Custom / In-House Monitoring
Apple Safari’s update also enables Real User Monitoring (RUM) platforms to surface this data for site owners:
- Akamai mPulse
- Cloudflare Web Analytics
- Datadog RUM
- Dynatrace
- Elastic Observability (RUM)
- New Relic Browser
- Raygun
- Sentry Performance
- SpeedCurve
- Splunk RUM
Apple’s official documentation explains:
“Safari 26.2 adds support for two tools that measure the performance of web applications, Event Timing API and Largest Contentful Paint.
The Event Timing API lets you measure how long it takes for your site to respond to user interactions. When someone clicks a button, types in a field, or taps on a link, the API tracks the full timeline — from the initial input through your event handlers and any DOM updates, all the way to when the browser paints the result on screen. This gives you insight into whether your site feels responsive or sluggish to users. The API reports performance entries for interactions that take longer than a certain threshold, so you can identify which specific events are causing delays. It makes measuring “Interaction to Next Paint” (INP) possible.
Largest Contentful Paint (LCP) measures how…
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