Soft Navigation Core Web Vitals: What Changed in CrUX

For years, Core Web Vitals had a blind spot. If your site was built as a single page app with React, Vue, Next.js or a headless Shopify front end, Chrome mostly measured the first page load and ignored everything after it. That just changed. On October 13, 2026, Google added experimental soft navigation Core Web Vitals to the Chrome User Experience Report, also called CrUX.

This one matters a lot to the kind of custom web development we do at Web Brick Studio, so here is a plain English breakdown of what changed, who it affects and what to do about it.

What is a soft navigation?

A normal, or “hard”, navigation is when you click a link and the browser loads a brand new page from the server. A soft navigation is when JavaScript swaps the content and updates the URL without a full reload. You see it in most modern web apps: dashboards, headless stores, booking flows and sites built with frameworks like Next.js, Nuxt or Remix.

Soft navigations feel fast to users, but until now they were hard to measure. Chrome’s Soft Navigations API, switched on by default since Chrome 151 in July, finally gives the browser a reliable way to spot them.

What Google added to CrUX

According to the announcement on web.dev, the October 2026 CrUX release includes three new experimental metrics:

• experimental_largest_contentful_paint_with_softnavs for loading
• experimental_interaction_to_next_paint_with_softnavs for responsiveness
• experimental_cumulative_layout_shift_with_softnavs for visual stability

They are available in the CrUX BigQuery dataset, the CrUX API and the CrUX History API. You can also flip a toggle in CrUX Vis to compare them with the normal scores. Chrome plans to add soft navigation versions of First Contentful Paint and navigation types in the November release.

Does soft navigation Core Web Vitals data affect rankings?

Not today. Google says the stable Core Web Vitals scores stay exactly as they are while the experimental versions are tested side by side. Chrome is aiming to end the experiment in May 2027, and after that Search Console will switch to the new data.

So there is no reason to panic, but there is a good reason to look now. You have roughly seven months to see how your site scores before these numbers start showing up in the reports most SEO teams watch.

Which sites will see a difference?

Most sites will see little or no change. Search Engine Journal reports that about 70% of origins have almost no soft navigation traffic. If you run a standard WordPress or Shopify theme, where every click loads a new page, your numbers should look the same.

The sites that will notice are the ones built as apps:

• Headless ecommerce front ends
• SaaS products and customer dashboards
• Booking, quote and checkout flows built in React or Vue
• Large content sites using client side routing

Among the top 1,000 sites, 35% on Android and 42% on desktop rely on soft navigations for more than half of their page views. For many of those sites the new scores will actually look better, because the slow first load is no longer the only thing measured. INP in particular is now judged per page view.

What to do now

1. Check CrUX Vis. Look up your origin at cruxvis.withgoogle.com and turn on the soft navigation toggle.
2. Find your slow views. If the experimental LCP or CLS is worse than the stable one, a specific in app view is likely the cause, often a product grid or dashboard that loads data late.
3. Add real user monitoring. Chrome’s soft navigation docs show how to measure these views yourself, so you are not waiting a month for CrUX.
4. Reserve space for content. Most soft navigation layout shift comes from images and data blocks that pop in. Fixed heights and skeleton states fix most of it.
5. Keep JavaScript lean. Heavy event handlers are the usual INP problem. Split work and avoid large re renders on every click.

If your site is a traditional WordPress build, the classic advice still applies. Our post on how to speed up a WordPress website covers the basics.

Frequently asked questions

Do I need to rebuild my single page app?

No. Most SPAs will score the same or better under the new metrics. Use the data to find specific weak views and fix those.

When will Search Console use soft navigation data?

Google is targeting May 2027 to end the experimental phase, after which Search Console will move to the new data.

Does this affect WordPress or Shopify themes?

Mostly not, because standard themes use full page loads. Headless or custom front ends are the main group affected.

Building a fast web app?

Web Brick Studio does custom web development as well as WordPress and Shopify. We build fast front ends, dashboards and headless stores, and we can audit your Core Web Vitals before Google starts reporting the new numbers. Get a free performance audit or see our work.