Google reported that users who experienced a 400ms delay performed 0.44% fewer searches during the first three weeks and 0.76% fewer searches during the second three weeks. Permalink Share on Twitter

Removing one client-side redirect from Google's DoubleClick resulted in a 12% improvement in click-through rate. Permalink Share on Twitter

Yahoo increased traffic by 9% for each 400ms of improvement in load time. Permalink Share on Twitter

Shopzilla decreased load time by 5 seconds and saw a 12% increase in conversion rate, a 25% increase in page views and a 50% reduction in infrastructure required. Permalink Share on Twitter

Mozilla cut load time by 2.2 seconds and saw download conversions increase by 15.4% Permalink Share on Twitter

Google finds a 500ms increase in page load results in 25% less searches. Permalink Share on Twitter

Etsy saw a 12% increase in bounce rate when they added 160KB of images to their mobile page. Permalink Share on Twitter

One second delay in Bing results in a 2.8% drop in revenue. Two second delay results in 4.3% drop. Permalink Share on Twitter

Amazon sees a 1% decrease in revenue for every 100ms increase in load time. Permalink Share on Twitter

The Aberdeen Group discovered a 1-second delay resulted in 11% fewer page views, a 16% decrease in customer satisfaction, and 7% loss in conversions. Permalink Share on Twitter