WPO Stats

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

  • WPO Stats Icon

    Zalando saw a 0.7% increase in revenue when they shaved 100ms off their load time. Permalink Share on Twitter

    #posts #revenue #2018
  • Tokopedia Logo

    Tokopedia reduced render time from 14s to 2s for 3G connections and saw a 19% increase in visitors, 35% increase in total sessions, 7% increase in new users, 17% increase in active users and 16% increase in sessions per user. Permalink Share on Twitter

    #posts #sessions #reach #engagement #traffic #2018
  • Missguided Logo

    Fashion retailer Missguided removed BazaarVoice for Android visitors. Median page load time improved by 4 seconds, and revenue increased by 26% Permalink Share on Twitter

    #posts #revenue #2018
  • WPO Stats Icon

    Furniture retailer Zitmaxx Wonen reduced their typical load time to 3 seconds and saw conversion jump 50.2%. Overall revenue from the mobile site also increased by 98.7%. Permalink Share on Twitter

    #posts #conversion #revenue #2017
  • WPO Stats Icon

    COOK increased conversion rate by 7% after cutting average page load time by 0.85 seconds. Bounce rate also fell by 7% and pages per session increased by 10%. Permalink Share on Twitter

    #posts #conversion #engagement #bounce rate #2017
  • WPO Stats Icon

    Rebuilding Pinterest pages for performance resulted in a 40% decrease in wait time, a 15% increase in SEO traffic and a 15% increase in conversion rate to signup. Permalink Share on Twitter

    #posts #conversion #seo #2017
  • Financial Times Logo

    Tests of the new, faster FT.com showed users were up to 30% more engaged—meaning more visits and more content being consumed. Permalink Share on Twitter

    #posts #publishing #engagement #page views #2016
  • WPO Stats Icon

    BBC has seen that they lose an additional 10% of users for every additional second it takes for their site to load Permalink Share on Twitter

    #posts #abandonment #2017
  • WPO Stats Icon

    Ancestory.com saw a 7% increase in conversions after improving render time by 68%, page weight by 46% and load time by 64%. Permalink Share on Twitter

    #posts #conversion #2016
  • WPO Stats Icon

    AliExpress reduced load time by 36% and saw a 10.5% increase in orders and a 27% increase in conversion for new customers. Permalink Share on Twitter

    #posts #orders #conversion #2016
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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.