Ten things every marketer should know about web performance no. 4: How testing can harm sales

A major retailer recently removed an A/B testing service from its website. Average load time improved by nine per cent. Conversions rose by ten per cent. Bounce rate also improved by four per cent, and engagement (measured by pages per session) increased by two per cent.
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How we predicted an increase in conversions from a decrease in load times

One of the biggest challenges we share with our clients is proving the business value of web performance. While it’s logical that faster websites mean happier customers and more revenue, it can be hard to provide absolute proof.

We previously relied on publicly available case studies, a fantastic collection of which is available at WPO Stats.

Our Real User Monitoring (RUM) solution has a better answer: predicting the absolute business impact of faster web pages.
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Web performance jargon buster

If you care about delivering an effective and profitable website, you need to care about making it fast. But the world of web performance is full of jargon that can make it inaccessible. So we thought we’d put together a glossary of some of the key terms for the uninitiated. Note that we’re focusing on definitions as they relate to web performance – some may have slightly different or broader meanings in different contexts.
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