---
title: "Web-Perf Wednesday 003 – Native SPA Metrics Have Arrived – CSS Wizardry"
url: https://daily.dev/posts/web-perf-wednesday-003-native-spa-metrics-have-arrived-css-wizardry-ia9s4dkoc
source_url: https://csswizardry.com/2026/08/web-perf-wednesday-003-native-spa-metrics-have-arrived
type: article
source: "CSS Wizardry"
author: "Harry Roberts"
published: 2026-08-05T20:47:25.542Z
updated: 2026-08-24T07:00:28.392Z
tags: ["webdev", "google-chrome"]
reading_time: 6
upvotes: 3
comments: 0
language: en
---

> ## Documentation Index
> Fetch the complete documentation index at: https://daily.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Web-Perf Wednesday 003 – Native SPA Metrics Have Arrived – CSS Wizardry

**[CSS Wizardry](https://daily.dev/sources/csswizardry)** · [@csswizardry](https://daily.dev/csswizardry) · 6 min read · 3 upvotes · 0 comments

## Summary

Chrome 151 has landed stable support for soft-navigation and interaction-contentful-paint entries on the Performance Timeline, enabling native SPA measurement for the first time. The web-vitals v6 library ships alongside it with support for these new metrics, a one-second requestIdleCallback cap, and improved INP reporting after bfcache restores. The key warning: this is not a drop-in upgrade. One document can now produce multiple metric lifecycles, which risks double-counting, population shifts, and false regressions in existing dashboards. A parallel-run migration strategy is recommended — comparing v5 and v6 side by side, validating route detection, reconciling percentiles within agreed tolerances, and retaining instrumentation metadata before cutting over. Chrome 152 Beta also introduces a coarse CPU Performance Tier API for better device segmentation, and Connection Allowlists that turn third-party endpoint inventories into enforced browser-level contracts. Safari 26.6 fixes a persistent bad state caused by missing service worker scripts.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://csswizardry.com/2026/08/web-perf-wednesday-003-native-spa-metrics-have-arrived>

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---

Tags: [#webdev](https://daily.dev/tags/webdev), [#google-chrome](https://daily.dev/tags/google-chrome)

[View this post on daily.dev](https://daily.dev/posts/web-perf-wednesday-003-native-spa-metrics-have-arrived-css-wizardry-ia9s4dkoc)