Key Takeaways:
- 97.1% of dealership websites fail Google Core Web Vitals on mobile or desktop, a failure rate that is costing dealerships $30 of every $100 spent on digital advertising.
- Mobile interactivity failures affect 88% of dealer sites, with a median response time of 313 milliseconds compared with Google’s 200-millisecond requirement for Interaction to Next Paint.
- Layout shift issues affect 92% of desktop dealer sites, a sign of technical debt that has persisted across three straight years of industry research.
Dealership websites are shockingly consistent, but not in a way that builds trust. For the third year running, research from automotive website and marketing platform Overfuel shows that nearly every site operated by North America’s largest dealer groups fails the real-world performance test Google uses to judge the mobile web. Of 2,318 retail sites tested with sufficient field data, only 67 passed Core Web Vitals on both mobile and desktop. That’s a 2.9% pass rate.
This matters because Google doesn’t treat Core Web Vitals as a courtesy metric. Sites that load quickly, respond to taps without delay, and hold their layout steady are rewarded with better visibility across Search, Maps, and increasingly, AI-generated answers. Sites that fail those same tests risk losing ground to competitors who get the basics right. Dealerships already compete for a shrinking pool of in-market shoppers who aren’t interested in technical inconvenience. This is a business problem with a dollar figure attached.
Mobile and Desktop Are Both Falling Short
The Overfuel study, which expanded this year from the top 50 dealer groups to all 150 groups on the Automotive News Top 150 Dealership Groups list, tested 2,715 domains against Google’s Chrome User Experience Report (CrUX). The CrUX data reflects the actual visitor experience across an entire website rather than a single page tested in a lab, making it a stricter and more honest measure of performance.
The results were not encouraging. Only 67 sites, or 2.9%, passed on both mobile and desktop. Another 299 passed on desktop only, and 26 passed on mobile only. The remaining 1,923 sites, or 83.1%, failed on both platforms. Put differently, more than four out of five dealership sites in the study deliver a poor experience no matter which device a shopper uses.
This isn’t a new finding. Overfuel’s 2024 study found fewer than 1% of top 50 sites passing both tests. In 2025, the number dropped to 0.4%. Even with a much larger sample in 2026, the pass rate has barely moved. Three years of data point to the same conclusion: most of the industry has not fixed the underlying problem.
Why Mobile Shoppers Are Getting the Worst of It
Google’s Core Web Vitals measure three things: how fast a page loads, how quickly it responds to a tap, and whether the layout stays put while the shopper uses it. On mobile, the load speed metric, known as Largest Contentful Paint, has actually improved, with 51.4% of sites now delivering a good score.
The real breakdown happens after the page loads. Interaction to Next Paint, which measures how quickly a page responds when someone taps a button or fills out a form, is where mobile sites are failing. Only 14.3% of dealer sites meet Google’s 200-millisecond threshold, and the median site takes 313 milliseconds to respond. Slow interactivity contributes to 88% of all mobile failures. For a shopper trying to schedule a test drive or check inventory on a phone, that lag can be the difference between a submitted lead and an abandoned session.
Desktop’s Quiet Problem: Layout Shift
Desktop sites face a different issue. Cumulative Layout Shift measures how much a page’s elements jump around as it loads, something that happens when banners, chat widgets, or incentive bars load late and push content around the screen. Only 22.5% of dealer sites keep their layout steady on desktop, and layout shift contributes to 92% of desktop failures. A shopper who clicks what looks like a financing button, only to have the page shift and send the click somewhere else, is unlikely to try again.
The Cost of Getting It Wrong
None of this would matter much if it were only a technical curiosity. It isn’t. Shift Digital’s 2025 Digital Automotive Shopping Pulse Report found that dealerships with failing Core Web Vitals waste approximately $30 of every $100 spent on advertising. With 97% of the largest groups’ sites failing, most of the industry is paying that tax on every campaign it runs. Slow, unstable pages drive up bounce rates, depress quality scores, and quietly erode the return on media spend that marketing teams fight hard to secure.
Why the Problem Persists
Part of the answer lies in the platforms dealerships run on. Many legacy website systems rely on heavy client-side code that slows page load times. Layered on top of that is what Overfuel calls tag sprawl: multiple analytics tools, chat widgets, and third-party scripts, each adding its own delay. Inventory pages, which carry the heaviest image loads and the highest shopper intent, often suffer the most.
There’s also a structural gap between how sites are built and how they’re maintained. A site might launch in good shape, then accumulate scripts, plugins, and promotional banners over time until performance quietly degrades. Few dealership marketing teams have the bandwidth to monitor Core Web Vitals continuously, especially when the metric competes with inventory updates, advertising campaigns, and day-to-day store operations for attention.
What Dealerships Can Do Now
The good news buried in the data is that hundreds of sites are close to passing. Overfuel found that 379 sites fail mobile on a single metric, and 680 fail desktop on a single metric, meaning a focused fix could flip the result. Dealerships looking to improve should start by measuring real user data rather than lab scores, paying particular attention to vehicle detail and search results pages where shoppers spend the most time. From there, reducing JavaScript that blocks mobile responsiveness, reserving space for images and ads to prevent layout shift, and compressing hero images to protect load speed are the highest-impact fixes. Setting performance standards with website vendors, including any OEM-required tools, and tracking Core Web Vitals alongside lead volume and conversion rate in analytics platforms helps keep performance from sliding back once it improves.
Core Web Vitals Are No Longer Optional
Three years of consistent research points to the same reality: Core Web Vitals compliance is a competitive line most dealerships haven’t crossed. As AI-driven search and discovery tools become a bigger part of how shoppers find vehicles, dealerships that fix their site’s underlying performance now will be better positioned as search rules continue to change. The alternative, staying on the wrong side of a 97% failure rate, means continuing to pay a tax on every advertising dollar spent.
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