Case studies: the benefits of optimizing Core Web Vitals

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Case studies: the benefits of optimizing Core Web Vitals

With many cool case studies for Core Web Vitals on the Internet, we have listed the most popular and reliable ones. Fine, you can quickly scan through them and see the added value of web performance and Core Web Vitals optimization in no time!

Business impact Core Web Vitals


  • Key takeaway: People who have a negative experience on mobile are 62% less likely to make a future purchase
  • Year published: 2017
  • Source: Think With Google

According to a study conducted by Google, an in-depth examination was performed on 11 million mobile ads' landing pages in 213 countries. The findings revealed that a significant number of mobile websites did not meet users' expectations due to their slow loading speeds. The longer it took for a page to load, the higher the chance of a mobile site user leaving without taking any action. Consequently, the likelihood of conversion also decreased, sometimes by as much as 95%.

  • 70% of people use their smartphones to research products and services before making a purchase.
  • 60% of people say they're more likely to do business with a company that has a mobile-friendly website.
  • 52% of people say they've abandoned a mobile app because it was too difficult to use.


Vodafone Core Web Vitals

  • Key takeaway: A 31% improvement in LCP increased sales by 8%
  • Year published: 2021
  • Source:
  • Optimized metrics: LCP and conversions

Vodafone is a leading telecommunications company that wanted to improve the performance of its website. They found that the Largest Contentful Paint (LCP) metric was slow, which meant that the main content of the page took a long time to load. This had a negative impact on user experience and sales.

  • 10% increase in organic search traffic.
  • 5% increase in conversion rate.
  • 2% decrease in bounce rate.


ebay core web vitals

  • Key takeaway: -100ms resulted in a +0.5% more "Add to Cart" count
  • Year published: 2020
  • Source: and Ebay Engineering
  • Optimized metrics: TTFB, user engagement, conversions, and ROI

Ebay launched a company-wide program with the primary goal of highlighting information that appears above the fold. They based their efforts on measures such as Time To First Byte (TTFB) and Time to Above The Fold (TATF), but optimizations were only achievable if specific sections of the user experience were eliminated. Pages loaded 12% more quickly as a direct result of certain cutbacks and improvements made to information displayed above the fold, which also led to an increase of 0.5% more "add to cart" clicks.


Renault core web vitals

  • Key takeaway: A 1-second LCP increase can reduce bounce rate by 14% and boost conversions by 13%.
  • Year published: 2021
  • Source:
  • Optimized metrics: LCP, bounce rate, and conversions

Renault is a French multinational automobile manufacturer with a presence in over 130 countries. In order to improve user engagement and conversions on its brand sites, Renault took steps to optimize its Core Web Vitals, specifically Largest Contentful Paint (LCP). By reducing LCP, Renault was able to make its pages load faster and improve the user experience. As a result, the company saw a decrease in bounce rate and an increase in conversion rate.


RedBus Core Web Vitals

  • Key takeaway: Improving their website's Interaction to Next Paint (INP) and increased sales by 7%
  • Year published: 2023
  • Source:
  • Optimized metrics: INP and sales numbers

redBus is an Indian online bus ticketing platform that operates in over 2,300 cities and towns across India. In order to improve the user experience of its website, redBus measured and optimized its Interaction to Next Paint (INP) metric. INP measures the time it takes for a user to interact with a page after it has finished loading. By reducing INP, redBus was able to make its website feel more responsive and improve the user experience.

  • Reduced INP by an average of 250 ms

The Economic Times

  • Key takeaway: Achieving an overall 43% better bounce rate
  • Published: 2021
  • Source:
  • Optimized metrics: LCP, CLS, and bounce rate

The Economic Times is a major Indian news website. In 2021, they took on the challenge of improving their Core Web Vitals (CWV) scores. CWV is a set of metrics that measure the loading performance of a website. By improving their CWV scores, The Economic Times hoped to improve the user experience of their website and reduce bounce rates.

  • Their LCP improved by 80%
  • Their CLS improved by 250%
  • Which resulted in an overall better bounce rate of 43%


Swappie Core Web Vitals

  • Key takeaway: +42% mobile revenue by focusing on Core Web Vitals
  • Year published: 2021
  • Source:
  • Optimized metrics: LCP, CLS, and revenue

Swappie, a thriving start-up, specializes in the sale of refurbished phones. For a considerable period, their focus was primarily on improving the functionality of their website rather than prioritizing site performance. Nevertheless, upon realizing that their mobile earnings were lagging behind the desktop counterpart of their site, they concluded that a transformation was necessary. In order to address the problem, they made the decision to prioritize the enhancement of Core Web Vitals, which ultimately led to the desired outcomes.

  • LCP improved by 55%
  • CLS improved by 91%
  • FID improved by 90%


Yelp Core Web Vitals

  • Key takeaway: Optimizing FCP boosted conversions by 15%
  • Year published: 2021
  • Source: Yelp Engineering Blog
  • Optimized metrics: FCP, LCP, and conversions

Yelp recently added options that give advertisers more control over their advertising campaigns. However, adding these features slowed the website, increasing page load speeds from 3 seconds to 6 seconds. The development team improved FCP and TTI measurements to reduce this performance decrease, resulting in a great user experience and a 15% conversion improvement.


  • Key takeaway: Conversion rate increased by 5% and traffic by 10%, leading to a total 15% increase in revenue.
  • Year published: 2023
  • Source: Shopify Performance Blog
  • Optimized metrics: LCP, CLS, conversion, and traffic.

Shopify and Carpe's successful collaboration to optimize Carpe's online store is highlighted here. Shopify collaborated with Carpe's team to fix performance issues, improving website metrics. The joint effort improved user experience by 52% faster Largest Contentful Paint and 41% faster Cumulative Layout Shift. These technical upgrades increased Carpe's store conversion rate by 5%, web traffic by 10%, and revenue by 15%. After seeing their online store slow down, Carpe, which makes products for embarrassing sweat, contacted Shopify. Both teams worked together to solve performance issues and produce fast, effective results.


  • Key takeaway: How Trendyol reduced INP by 50%, resulting in a 1% uplift on click-through rate
  • Year published: 2023
  • Source: Google
  • Optimized metrics: INP and CTR

Trendyol, an ecommerce platform with 30 million customers and 240,000 sellers, is the first Turkish business worth over $10 billion and one of the world's top ecommerce platforms.

Trendyol prioritized Interaction to Next Paint (INP) to deliver the best user experience at scale while maintaining content flexibility and using an older version of React. Trendyol's PLP INP improvement reduced the INP by 50% and increased search result business metric by 1%.

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