Onload

Definition: that the onload event is triggered, including content, images, JavaScript, CSS, and other external files.

Why it's good: Onload is a universal marker on pages supported by all browsers. This allows us to benchmark and understand the differences between browsers and their impact on page performance.

What to consider: Due to the critical content in the early parts of the page, we often find a very high correlation between onload and revenue. As a result, we recommend using onload as a core benchmark for understanding performance and customer journey friction.

It is possible for the dev team to artificially fire the onload event early to trigger conditionals but not have a completed page. In this case, we often see unhealthy conversion rate curves.