WPO Stats

Case studies and experiments demonstrating the impact of web performance optimization (WPO) on user experience and business metrics.

  • WPO Stats Icon

    Swappie reduced load time by 23%, LCP by 55%, CLS by 91% and FID by 90% and saw a 42% increase in mobile revenue and a 10 percentage point increase in relative mobile conversion rate. Permalink Share on Twitter

    #posts #revenue #conversion rate #2021
  • WPO Stats Icon

    NDTV, one of India's leading news stations and websites, improved LCP by 55% and saw a 50% reduction in bounce rate. Permalink Share on Twitter

    #posts #bounce rate #core web vitals #2020
  • WPO Stats Icon

    iCook improved CLS by 15% and saw a 10% increase in ad revenue as a result. Permalink Share on Twitter

    #posts #ads #core web vitals #2021
  • Tokopedia Logo

    Tokopedia improved LCP by 55% and saw a 23% increase in average session duration. Permalink Share on Twitter

    #posts #session duration #core web vitals #2021
  • WPO Stats Icon

    Vodafone improved their LCP by 31%, resulting in an 8% increase in sales, a 15% increase in their lead to visit rate, and an 11% increase in their cart to visit rate. Permalink Share on Twitter

    #posts #sales #core web vitals #2021
  • WPO Stats Icon

    Yahoo! Japan News reduced CLS by .2, decreasing the number of URLS with poor performance in search console by 98%. As a result, they saw a 15.1% increase in page views per session, 13.3% longer session durations and a 1.72 percentage point decrease in bounce rate. Permalink Share on Twitter

    #posts #page views #sessions #bounce rate #session duration #2021 #core web vitals
  • Yelp Logo

    Yelp reduced First Contentful Paint (75th percentile) by 45% and Yelp Page Complete (75th percentile) by 25% and saw a 15% improvement in their conversion rate. Permalink Share on Twitter

    #posts #user timing #conversion #2021
  • Bing Logo

    Bing observed that an engineer that improves server performance by 10ms (that’s 1/30 of the speed that our eyes blink) more than pays for his fully-loaded annual costs. Every millisecond counts Permalink Share on Twitter

    #posts #server #search #revenue #2013
  • WPO Stats Icon

    Bridesmaid dress retailer Revelry relaunched its ecommerce site on an updated version of its ecommerce platform and with smaller images. The site loads 43% faster, bounce rates have decreased 8% and conversion is up 30% Permalink Share on Twitter

    #posts #bounce rate #conversion #2020
  • Agrofy Logo

    After making improvements to multiple performance metrics (including LCP, CLS and Long Task time), Agrofy saw a 76% reduction in their abandonment rate and a significant boost in engagement. Permalink Share on Twitter

    #posts #engagement #abandonment #2020 #core web vitals
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Hungry for more?

If you're looking for more resources around selling performance, we recommend the following resources:

  • Time is Money book cover

    Time is Money by Tammy Everts

    Tammy's book has study after study after study about why performance matters. She covers not just the business side of things, but also the psychology of performance: how does bad performance make users feel.
  • Designing for Performance book cover

    Designing for Performance by Lara Hogan

    Lara's book is loaded with great information about advocating for performance within your organization.

Help make WPO Stats better by submitting your favorite performance case study.

@2024. A Tammy Everts and Tim Kadlec production.