navigationStart event is initiated by a user clicking a link or hitting enter after typing a URL in a browser navigation bar.In terms of browser navigation timing API, it’s a difference between navigationStart and domComplete events: The original metric used for the 2015 experiment was overall page load time (PLT) which is defined as time from the user typing in a URL or clicking on a URL and the whole page being rendered. MeasurementĪs a first step we needed to clearly define and implement metrics we wanted to improve. In this post, we’ll cover how we improved performance on Pinterest pages, and how it led to the biggest increase in user acquisition of 2016. It was a huge effort, and to achieve it, we needed to start from building robust metrics to track our progress for all parts of the serving system. To productionize learnings from this experiment, the entire front end engine, all page templates and common elements had to be rewritten. However, the experiment was a hacky solution that used a lot of shortcuts like serving pre-rendered HTML pages without using any internal template rendering engines or common resources (JS, CSS).

In early 2015 Pinterest engineers ran an experiment that improved mobile web home landing page performance by 60 percent and mobile signup conversion rate by 40 percent. Sam Meder, Vadim Antonov & Jeff Chang | Pinterest engineers, Growth Driving user growth with performance improvements

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