New Index offers actionable insights from 500M+ shopper sessions across 700+ brands, transforming how retailers evaluate the business impact of site speed, third-party scripts, and Core Web Vitals
Waltham, MA – September 30, 2025 – Yottaa, the leading all-in-one website performance solution for eCommerce brands and retailers, today announced the launch of a new, dynamic version of its Web Performance Index, an interactive benchmarking tool that aggregates eCommerce site performance data from over 500 million shopper sessions across 700+ leading eCommerce brands. Unlike static reports, the enhanced Index reflects ongoing, commerce-specific site performance across metrics like Core Web Vitals, page load speed, bounce rate, and conversion indicators — filterable by industry, platform, and device type.
“Performance isn’t a pass/fail badge — it’s a race,” said Darin Archer, Chief Product Officer at Yottaa. “The Web Performance Index turns hundreds of millions of shopper sessions into a living benchmark, so brands can see — in near real time — how they stack up by industry, platform, and device. Passing Core Web Vitals isn’t the finish line; if your peers are faster and converting better, you’re still losing ground. This Index gives teams the context and direction to prioritize what will move revenue.”
Key Highlights from the Index
- Fewer Than Half of Retail Sites Pass Core Web Vitals: Despite their impact on search visibility and user experience, fewer than 50% of retail sites currently meet Google’s Core Web Vitals thresholds, putting both traffic and conversions at risk.
- Passing Is Just the Starting Line: Hitting Core Web Vitals’ “passing” scores is table stakes. Yottaa’s data shows that real revenue growth happens when brands push beyond the baseline.
- A 50% Conversion Lift from LCP Reduction: Reducing Largest Contentful Paint (LCP) from the passing threshold of 2.5 seconds to just 1.3 seconds results in a 50% increase in conversions — proving that faster means real business growth.
- Milliseconds Matter: 14% Conversion Lift from Faster INP: Cutting Interaction to Next Paint (INP) from 200ms to 50ms boosts conversion rates by nearly 14%. These subtle improvements add up to major revenue wins at scale.
- The Hidden Tax of Third-Party Apps: Retailers run 40+ third-party apps per page on average, accounting for nearly 60% of total load time. The heaviest apps add over 3.6 seconds of delay and create nearly 2x the conversion drag of lighter ones. Without optimization, these tools silently erode site speed and sales.
In over a decade of working with retailers, I’ve seen how hard it is to get clear performance benchmarks,” said Shawn O’Neill, VP of Performance Consulting at Yottaa. “The Index delivers that clarity. It turns anonymized, real-world data into a roadmap for smarter decisions — whether you’re evaluating third-party apps, planning a major campaign, or trying to align stakeholders around web performance as a revenue driver. This is the kind of visibility I wish my clients had years ago.”
The upgraded Web Performance Index introduces new capabilities that deepen its value:
- Interactive Exploration: Users can explore real-world performance trends across key metrics and filters, providing actionable data and benchmarks for teams across marketing, eCommerce, and web development.
- Performance Impact Ratings (PIR): Yottaa’s proprietary scoring system has long been used to evaluate the toll of third-party technologies. Now, PIR is available in an interactive format. Teams can search and filter third parties by PIR score, adoption level, and category, helping retailers make smarter, data-driven decisions about their tech stack.
- Continuously Updated Insights: The Index updates daily to give teams the most current snapshot of retail performance across industries and platforms — a valuable resource during planning cycles, platform evaluations, and seasonal prep.
“The Web Performance Index reframes site speed as a strategic growth driver,” said Matt Ezyk, Senior Director of Engineering, Ecommerce at Hanna Andersson. “The connection from performance to conversion and revenue is unmistakable. What’s clear is that Core Web Vitals are only the baseline. The true opportunity lies in going beyond those thresholds to unlock competitive advantage. The ability to filter benchmarks by what matters to our business makes the insights not just eye-opening, but directly actionable.”
Explore the full Web Performance Index at: https://rapid.yottaa.com/web-performance-index/.
All data cited in this release comes from the Yottaa Web Performance Index (WPI). Metrics were pulled from the WPI as of September 23, 2025. The WPI updates daily, so figures may shift slightly over time.
About Yottaa
Yottaa empowers digital teams to unlock revenue with faster, more reliable storefronts through strategic consulting, fully managed services, and self-serve performance software. From site code and third-party app optimization to infrastructure and security management, Yottaa gives brands the visibility and control they need to turn site performance into a growth driver. Trusted by over 1,500 leading brands and retailers, Yottaa delivers measurable improvements in speed, engagement, and conversions. Learn more at yottaa.com.
Media Contact
Walker Sands, for Yottaa, Inc.
yottaa@walkersands.com
